diff --git a/.agents/skills/discover-zig/SKILL.md b/.agents/skills/discover-zig/SKILL.md
new file mode 100644
index 0000000..04c2f10
--- /dev/null
+++ b/.agents/skills/discover-zig/SKILL.md
@@ -0,0 +1,73 @@
+---
+name: discover-zig
+description: Automatically discover Zig programming skills when working with Zig. Activates for zig development tasks.
+---
+
+# Zig Skills Discovery
+
+Provides automatic access to comprehensive zig skills.
+
+## When This Skill Activates
+
+This skill auto-activates when you're working with:
+- Zig
+- systems programming
+- comptime
+- allocators
+- C interop
+- build.zig
+- zon package manager
+
+## Available Skills
+
+### Quick Reference
+
+The Zig category contains 6 skills:
+
+1. **zig-build-system**
+2. **zig-c-interop**
+3. **zig-memory-management**
+4. **zig-package-management**
+5. **zig-project-setup**
+6. **zig-testing**
+
+### Load Full Category Details
+
+For complete descriptions and workflows:
+
+```bash
+cat ~/.claude/skills/zig/INDEX.md
+```
+
+This loads the full Zig category index with:
+- Detailed skill descriptions
+- Usage triggers for each skill
+- Common workflow combinations
+- Cross-references to related skills
+
+### Load Specific Skills
+
+Load individual skills as needed:
+
+```bash
+cat ~/.claude/skills/zig/zig-build-system.md
+cat ~/.claude/skills/zig/zig-c-interop.md
+cat ~/.claude/skills/zig/zig-memory-management.md
+```
+
+## Progressive Loading
+
+This gateway skill enables progressive loading:
+- **Level 1**: Gateway loads automatically (you're here now)
+- **Level 2**: Load category INDEX.md for full overview
+- **Level 3**: Load specific skills as needed
+
+## Usage Instructions
+
+1. **Auto-activation**: This skill loads automatically when Claude Code detects zig work
+2. **Browse skills**: Run `cat ~/.claude/skills/zig/INDEX.md` for full category overview
+3. **Load specific skills**: Use bash commands above to load individual skills
+
+---
+
+**Next Steps**: Run `cat ~/.claude/skills/zig/INDEX.md` to see full category details.
diff --git a/.agents/skills/zig-best-practices/C-INTEROP.md b/.agents/skills/zig-best-practices/C-INTEROP.md
new file mode 100644
index 0000000..87e4c72
--- /dev/null
+++ b/.agents/skills/zig-best-practices/C-INTEROP.md
@@ -0,0 +1,89 @@
+# C Interoperability in Zig
+
+Zig can directly import C headers, call C functions, and expose Zig functions to C. Use these patterns when integrating with existing C libraries or system APIs.
+
+## When to Use
+
+- Wrapping C libraries (raylib, SDL, curl)
+- Calling platform-specific system APIs
+- Passing callbacks to C code
+- Writing Zig libraries callable from C
+
+## Importing C Headers
+
+Use `@cImport` to import C headers directly:
+
+```zig
+const ray = @cImport({
+    @cInclude("raylib.h");
+});
+
+pub fn main() void {
+    ray.InitWindow(800, 450, "window title");
+    defer ray.CloseWindow();
+
+    ray.SetTargetFPS(60);
+    while (!ray.WindowShouldClose()) {
+        ray.BeginDrawing();
+        defer ray.EndDrawing();
+        ray.ClearBackground(ray.RAYWHITE);
+    }
+}
+```
+
+Configure include paths in `build.zig`:
+
+```zig
+exe.addIncludePath(.{ .cwd_relative = "/usr/local/include" });
+exe.linkSystemLibrary("raylib");
+```
+
+## Extern Functions (System APIs)
+
+Call platform APIs without bindings using `extern`:
+
+```zig
+const win = @import("std").os.windows;
+
+extern "user32" fn MessageBoxA(
+    ?win.HWND,
+    [*:0]const u8,
+    [*:0]const u8,
+    u32,
+) callconv(.winapi) i32;
+```
+
+## C Callbacks
+
+Pass Zig functions to C libraries using `callconv(.C)`:
+
+```zig
+fn writeCallback(
+    data: *anyopaque,
+    size: c_uint,
+    nmemb: c_uint,
+    user_data: *anyopaque,
+) callconv(.C) c_uint {
+    const buffer: *std.ArrayList(u8) = @alignCast(@ptrCast(user_data));
+    const typed_data: [*]u8 = @ptrCast(data);
+    buffer.appendSlice(typed_data[0 .. nmemb * size]) catch return 0;
+    return nmemb * size;
+}
+```
+
+Key points:
+- `callconv(.C)` makes the function callable from C
+- `*anyopaque` is Zig's equivalent of `void*`
+- Use `@alignCast` and `@ptrCast` to recover typed pointers
+- Return 0 on error (C convention) since Zig errors can't cross FFI boundary
+
+## C Types Mapping
+
+| C Type | Zig Type |
+|--------|----------|
+| `void*` | `*anyopaque` |
+| `char*` | `[*:0]const u8` (null-terminated) |
+| `size_t` | `usize` |
+| `int` | `c_int` |
+| `unsigned int` | `c_uint` |
+| `NULL` | `null` |
diff --git a/.agents/skills/zig-best-practices/DEBUGGING.md b/.agents/skills/zig-best-practices/DEBUGGING.md
new file mode 100644
index 0000000..df15e9e
--- /dev/null
+++ b/.agents/skills/zig-best-practices/DEBUGGING.md
@@ -0,0 +1,70 @@
+# Debugging Memory in Zig
+
+Use GeneralPurposeAllocator (GPA) to detect memory leaks with stack traces showing allocation origins.
+
+## When to Use
+
+- Debugging memory leaks in development
+- Validating cleanup logic in complex systems
+- Investigating use-after-free or double-free bugs
+
+## GeneralPurposeAllocator Pattern
+
+```zig
+const std = @import("std");
+
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer std.debug.assert(gpa.deinit() == .ok);
+    const allocator = gpa.allocator();
+
+    // Use allocator for all allocations
+    const data = try allocator.alloc(u8, 1024);
+    defer allocator.free(data);
+
+    // Any leaked allocations will be reported at deinit
+}
+```
+
+## Configuration Options
+
+```zig
+var gpa = std.heap.GeneralPurposeAllocator(.{
+    .stack_trace_depth = 10,  // Stack frames to capture (default: 8)
+    .enable_memory_limit = true,
+    .requested_memory_limit = 1024 * 1024,  // 1MB limit
+}){};
+```
+
+## Leak Report Output
+
+When leaks occur, GPA prints:
+
+```
+error: memory leak detected
+Leak at 0x7f... (1024 bytes)
+    src/main.zig:42:25
+    src/main.zig:38:18
+    ...
+```
+
+## Testing with Leak Detection
+
+`std.testing.allocator` wraps GPA and fails tests on leaks:
+
+```zig
+test "no memory leaks" {
+    const allocator = std.testing.allocator;
+    var list: std.ArrayListUnmanaged(u32) = .empty;
+    defer list.deinit(allocator);
+
+    try list.append(allocator, 42);
+    // Test fails if list.deinit is missing
+}
+```
+
+## Production vs Debug
+
+- Use GPA in debug builds for safety
+- Switch to `std.heap.page_allocator` or arena in release for performance
+- `std.heap.c_allocator` when interfacing heavily with C code
diff --git a/.agents/skills/zig-best-practices/GENERICS.md b/.agents/skills/zig-best-practices/GENERICS.md
new file mode 100644
index 0000000..53d4c5c
--- /dev/null
+++ b/.agents/skills/zig-best-practices/GENERICS.md
@@ -0,0 +1,63 @@
+# Generic Data Structures in Zig
+
+Use comptime type parameters to create reusable generic containers. Return a type from a function to build type-safe collections.
+
+## When to Use
+
+- Implementing custom containers (queues, stacks, trees)
+- Building type-safe wrappers around allocations
+- Creating domain-specific collections
+
+## Pattern: Type-Returning Function
+
+```zig
+pub fn Queue(comptime Child: type) type {
+    return struct {
+        const Self = @This();
+        const Node = struct {
+            data: Child,
+            next: ?*Node,
+        };
+
+        allocator: std.mem.Allocator,
+        start: ?*Node,
+        end: ?*Node,
+
+        pub fn init(allocator: std.mem.Allocator) Self {
+            return Self{ .allocator = allocator, .start = null, .end = null };
+        }
+
+        pub fn enqueue(self: *Self, value: Child) !void {
+            const node = try self.allocator.create(Node);
+            node.* = .{ .data = value, .next = null };
+            if (self.end) |end| end.next = node else self.start = node;
+            self.end = node;
+        }
+
+        pub fn dequeue(self: *Self) ?Child {
+            const start = self.start orelse return null;
+            defer self.allocator.destroy(start);
+            if (start.next) |next| self.start = next else {
+                self.start = null;
+                self.end = null;
+            }
+            return start.data;
+        }
+    };
+}
+```
+
+## Key Techniques
+
+- `@This()` returns the enclosing struct type for self-reference
+- Nested `Node` struct keeps implementation details private
+- Allocator passed to init, stored for later operations
+- `defer` for cleanup in dequeue prevents leaks
+
+## Usage
+
+```zig
+var queue = Queue(u32).init(allocator);
+try queue.enqueue(42);
+const value = queue.dequeue(); // ?u32
+```
diff --git a/.agents/skills/zig-best-practices/SKILL.md b/.agents/skills/zig-best-practices/SKILL.md
new file mode 100644
index 0000000..e13cfde
--- /dev/null
+++ b/.agents/skills/zig-best-practices/SKILL.md
@@ -0,0 +1,442 @@
+---
+name: zig-best-practices
+description: Provides Zig patterns for type-first development with tagged unions, explicit error sets, comptime validation, and memory management. Must use when reading or writing Zig files.
+---
+
+# Zig Best Practices
+
+## Type-First Development
+
+Types define the contract before implementation. Follow this workflow:
+
+1. **Define data structures** - structs, unions, and error sets first
+2. **Define function signatures** - parameters, return types, and error unions
+3. **Implement to satisfy types** - let the compiler guide completeness
+4. **Validate at comptime** - catch invalid configurations during compilation
+
+### Make Illegal States Unrepresentable
+
+Use Zig's type system to prevent invalid states at compile time.
+
+**Tagged unions for mutually exclusive states:**
+```zig
+// Good: only valid combinations possible
+const RequestState = union(enum) {
+    idle,
+    loading,
+    success: []const u8,
+    failure: anyerror,
+};
+
+fn handleState(state: RequestState) void {
+    switch (state) {
+        .idle => {},
+        .loading => showSpinner(),
+        .success => |data| render(data),
+        .failure => |err| showError(err),
+    }
+}
+
+// Bad: allows invalid combinations
+const RequestState = struct {
+    loading: bool,
+    data: ?[]const u8,
+    err: ?anyerror,
+};
+```
+
+**Explicit error sets for failure modes:**
+```zig
+// Good: documents exactly what can fail
+const ParseError = error{
+    InvalidSyntax,
+    UnexpectedToken,
+    EndOfInput,
+};
+
+fn parse(input: []const u8) ParseError!Ast {
+    // implementation
+}
+
+// Bad: anyerror hides failure modes
+fn parse(input: []const u8) anyerror!Ast {
+    // implementation
+}
+```
+
+**Distinct types for domain concepts:**
+```zig
+// Prevent mixing up IDs of different types
+const UserId = enum(u64) { _ };
+const OrderId = enum(u64) { _ };
+
+fn getUser(id: UserId) !User {
+    // Compiler prevents passing OrderId here
+}
+
+fn createUserId(raw: u64) UserId {
+    return @enumFromInt(raw);
+}
+```
+
+**Comptime validation for invariants:**
+```zig
+fn Buffer(comptime size: usize) type {
+    if (size == 0) {
+        @compileError("buffer size must be greater than 0");
+    }
+    if (size > 1024 * 1024) {
+        @compileError("buffer size exceeds 1MB limit");
+    }
+    return struct {
+        data: [size]u8 = undefined,
+        len: usize = 0,
+    };
+}
+```
+
+**Non-exhaustive enums for extensibility:**
+```zig
+// External enum that may gain variants
+const Status = enum(u8) {
+    active = 1,
+    inactive = 2,
+    pending = 3,
+    _,
+};
+
+fn processStatus(status: Status) !void {
+    switch (status) {
+        .active => {},
+        .inactive => {},
+        .pending => {},
+        _ => return error.UnknownStatus,
+    }
+}
+```
+
+## Module Structure
+
+Larger cohesive files are idiomatic in Zig. Keep related code together: tests alongside implementation, comptime generics at file scope, public/private controlled by `pub`. Split only when a file handles genuinely separate concerns. The standard library demonstrates this pattern with files like `std/mem.zig` containing 2000+ lines of cohesive memory operations.
+
+## Instructions
+
+- Return errors with context using error unions (`!T`); every function returns a value or an error. Explicit error sets document failure modes.
+- Use `errdefer` for cleanup on error paths; use `defer` for unconditional cleanup. This prevents resource leaks without try-finally boilerplate.
+- Handle all branches in `switch` statements; include an `else` clause that returns an error or uses `unreachable` for truly impossible cases.
+- Pass allocators explicitly to functions requiring dynamic memory; prefer `std.testing.allocator` in tests for leak detection.
+- Prefer `const` over `var`; prefer slices over raw pointers for bounds safety. Immutability signals intent and enables optimizations.
+- Avoid `anytype`; prefer explicit `comptime T: type` parameters. Explicit types document intent and produce clearer error messages.
+- Use `std.log.scoped` for namespaced logging; define a module-level `log` constant for consistent scope across the file.
+- Add or update tests for new logic; use `std.testing.allocator` to catch memory leaks automatically.
+
+## Examples
+
+Explicit failure for unimplemented logic:
+```zig
+fn buildWidget(widget_type: []const u8) !Widget {
+    return error.NotImplemented;
+}
+```
+
+Propagate errors with try:
+```zig
+fn readConfig(path: []const u8) !Config {
+    const file = try std.fs.cwd().openFile(path, .{});
+    defer file.close();
+    const contents = try file.readToEndAlloc(allocator, max_size);
+    return parseConfig(contents);
+}
+```
+
+Resource cleanup with errdefer:
+```zig
+fn createResource(allocator: std.mem.Allocator) !*Resource {
+    const resource = try allocator.create(Resource);
+    errdefer allocator.destroy(resource);
+
+    resource.* = try initializeResource();
+    return resource;
+}
+```
+
+Exhaustive switch with explicit default:
+```zig
+fn processStatus(status: Status) ![]const u8 {
+    return switch (status) {
+        .active => "processing",
+        .inactive => "skipped",
+        _ => error.UnhandledStatus,
+    };
+}
+```
+
+Testing with memory leak detection:
+```zig
+const std = @import("std");
+
+test "widget creation" {
+    const allocator = std.testing.allocator;
+    var list: std.ArrayListUnmanaged(u32) = .empty;
+    defer list.deinit(allocator);
+
+    try list.append(allocator, 42);
+    try std.testing.expectEqual(1, list.items.len);
+}
+```
+
+## Memory Management
+
+- Pass allocators explicitly; never use global state for allocation. Functions declare their allocation needs in parameters.
+- Use `defer` immediately after acquiring a resource. Place cleanup logic next to acquisition for clarity.
+- Prefer arena allocators for temporary allocations; they free everything at once when the arena is destroyed.
+- Use `std.testing.allocator` in tests; it reports leaks with stack traces showing allocation origins.
+
+### Examples
+
+Allocator as explicit parameter:
+```zig
+fn processData(allocator: std.mem.Allocator, input: []const u8) ![]u8 {
+    const result = try allocator.alloc(u8, input.len * 2);
+    errdefer allocator.free(result);
+
+    // process input into result
+    return result;
+}
+```
+
+Arena allocator for batch operations:
+```zig
+fn processBatch(items: []const Item) !void {
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+    const allocator = arena.allocator();
+
+    for (items) |item| {
+        const processed = try processItem(allocator, item);
+        try outputResult(processed);
+    }
+    // All allocations freed when arena deinits
+}
+```
+
+## Logging
+
+- Use `std.log.scoped` to create namespaced loggers; each module should define its own scoped logger for filtering.
+- Define a module-level `const log` at the top of the file; use it consistently throughout the module.
+- Use appropriate log levels: `err` for failures, `warn` for suspicious conditions, `info` for state changes, `debug` for tracing.
+
+### Examples
+
+Scoped logger for a module:
+```zig
+const std = @import("std");
+const log = std.log.scoped(.widgets);
+
+pub fn createWidget(name: []const u8) !Widget {
+    log.debug("creating widget: {s}", .{name});
+    const widget = try allocateWidget(name);
+    log.debug("created widget id={d}", .{widget.id});
+    return widget;
+}
+
+pub fn deleteWidget(id: u32) void {
+    log.info("deleting widget id={d}", .{id});
+    // cleanup
+}
+```
+
+Multiple scopes in a codebase:
+```zig
+// In src/db.zig
+const log = std.log.scoped(.db);
+
+// In src/http.zig
+const log = std.log.scoped(.http);
+
+// In src/auth.zig
+const log = std.log.scoped(.auth);
+```
+
+## Comptime Patterns
+
+- Use `comptime` parameters for generic functions; type information is available at compile time with zero runtime cost.
+- Prefer compile-time validation over runtime checks when possible. Catch errors during compilation rather than in production.
+- Use `@compileError` for invalid configurations that should fail the build.
+
+### Examples
+
+Generic function with comptime type:
+```zig
+fn max(comptime T: type, a: T, b: T) T {
+    return if (a > b) a else b;
+}
+```
+
+Compile-time validation:
+```zig
+fn createBuffer(comptime size: usize) [size]u8 {
+    if (size == 0) {
+        @compileError("buffer size must be greater than 0");
+    }
+    return [_]u8{0} ** size;
+}
+```
+
+## Avoiding anytype
+
+- Prefer `comptime T: type` over `anytype`; explicit type parameters document expected constraints and produce clearer errors.
+- Use `anytype` only when the function genuinely accepts any type (like `std.debug.print`) or for callbacks/closures.
+- When using `anytype`, add a doc comment describing the expected interface or constraints.
+
+### Examples
+
+Prefer explicit comptime type (good):
+```zig
+fn sum(comptime T: type, items: []const T) T {
+    var total: T = 0;
+    for (items) |item| {
+        total += item;
+    }
+    return total;
+}
+```
+
+Avoid anytype when type is known (bad):
+```zig
+// Unclear what types are valid; error messages will be confusing
+fn sum(items: anytype) @TypeOf(items[0]) {
+    // ...
+}
+```
+
+Acceptable anytype for callbacks:
+```zig
+/// Calls `callback` for each item. Callback must accept (T) and return void.
+fn forEach(comptime T: type, items: []const T, callback: anytype) void {
+    for (items) |item| {
+        callback(item);
+    }
+}
+```
+
+Using @TypeOf when anytype is necessary:
+```zig
+fn debugPrint(value: anytype) void {
+    const T = @TypeOf(value);
+    if (@typeInfo(T) == .Pointer) {
+        std.debug.print("ptr: {*}\n", .{value});
+    } else {
+        std.debug.print("val: {}\n", .{value});
+    }
+}
+```
+
+## Error Handling Patterns
+
+- Define specific error sets for functions; avoid `anyerror` when possible. Specific errors document failure modes.
+- Use `catch` with a block for error recovery or logging; use `catch unreachable` only when errors are truly impossible.
+- Merge error sets with `||` when combining operations that can fail in different ways.
+
+### Examples
+
+Specific error set:
+```zig
+const ConfigError = error{
+    FileNotFound,
+    ParseError,
+    InvalidFormat,
+};
+
+fn loadConfig(path: []const u8) ConfigError!Config {
+    // implementation
+}
+```
+
+Error handling with catch block:
+```zig
+const value = operation() catch |err| {
+    std.log.err("operation failed: {}", .{err});
+    return error.OperationFailed;
+};
+```
+
+## Configuration
+
+- Load config from environment variables at startup; validate required values before use. Missing config should cause a clean exit with a descriptive message.
+- Define a Config struct as single source of truth; avoid `std.posix.getenv` scattered throughout code.
+- Use sensible defaults for development; require explicit values for production secrets.
+
+### Examples
+
+Typed config struct:
+```zig
+const std = @import("std");
+
+pub const Config = struct {
+    port: u16,
+    database_url: []const u8,
+    api_key: []const u8,
+    env: []const u8,
+};
+
+pub fn loadConfig() !Config {
+    const db_url = std.posix.getenv("DATABASE_URL") orelse
+        return error.MissingDatabaseUrl;
+    const api_key = std.posix.getenv("API_KEY") orelse
+        return error.MissingApiKey;
+    const port_str = std.posix.getenv("PORT") orelse "3000";
+    const port = std.fmt.parseInt(u16, port_str, 10) catch
+        return error.InvalidPort;
+
+    return .{
+        .port = port,
+        .database_url = db_url,
+        .api_key = api_key,
+        .env = std.posix.getenv("ENV") orelse "development",
+    };
+}
+```
+
+## Optionals
+
+- Use `orelse` to provide default values for optionals; use `.?` only when null is a program error.
+- Prefer `if (optional) |value|` pattern for safe unwrapping with access to the value.
+
+### Examples
+
+Safe optional handling:
+```zig
+fn findWidget(id: u32) ?*Widget {
+    // lookup implementation
+}
+
+fn processWidget(id: u32) !void {
+    const widget = findWidget(id) orelse return error.WidgetNotFound;
+    try widget.process();
+}
+```
+
+Optional with if unwrapping:
+```zig
+if (maybeValue) |value| {
+    try processValue(value);
+} else {
+    std.log.warn("no value present", .{});
+}
+```
+
+## Advanced Topics
+
+Reference these guides for specialized patterns:
+
+- **Building custom containers** (queues, stacks, trees): See [GENERICS.md](GENERICS.md)
+- **Interfacing with C libraries** (raylib, SDL, curl, system APIs): See [C-INTEROP.md](C-INTEROP.md)
+- **Debugging memory leaks** (GPA, stack traces): See [DEBUGGING.md](DEBUGGING.md)
+
+## References
+
+- Language Reference: https://ziglang.org/documentation/0.15.2/
+- Standard Library: https://ziglang.org/documentation/0.15.2/std/
+- Code Samples: https://ziglang.org/learn/samples/
+- Zig Guide: https://zig.guide/
diff --git a/.agents/skills/zig-docs/SKILL.md b/.agents/skills/zig-docs/SKILL.md
new file mode 100644
index 0000000..32d3576
--- /dev/null
+++ b/.agents/skills/zig-docs/SKILL.md
@@ -0,0 +1,149 @@
+---
+name: zig-docs
+description: Fetches Zig language and standard library documentation via CLI. Activates when needing Zig API details, std lib function signatures, or language reference content that isn't covered in zig-best-practices.
+---
+
+# Zig Documentation Fetching
+
+## Instructions
+
+- Use raw Codeberg sources for std lib documentation (most reliable)
+- Use pandoc for language reference from ziglang.org (works for prose content)
+- The std lib HTML docs at ziglang.org are JavaScript-rendered and return empty content; avoid them
+- Zig source files contain doc comments (`//!` for module docs, `///` for item docs) that serve as authoritative documentation
+
+## Quick Reference
+
+### Fetch Standard Library Source (Recommended)
+
+Standard library modules are self-documenting. Fetch source directly:
+
+```bash
+# Module source with doc comments
+curl -sL "https://codeberg.org/ziglang/zig/raw/branch/master/lib/std/<module>.zig"
+
+# Common modules:
+curl -sL "https://codeberg.org/ziglang/zig/raw/branch/master/lib/std/log.zig"
+curl -sL "https://codeberg.org/ziglang/zig/raw/branch/master/lib/std/mem.zig"
+curl -sL "https://codeberg.org/ziglang/zig/raw/branch/master/lib/std/fs.zig"
+curl -sL "https://codeberg.org/ziglang/zig/raw/branch/master/lib/std/heap.zig"
+curl -sL "https://codeberg.org/ziglang/zig/raw/branch/master/lib/std/debug.zig"
+curl -sL "https://codeberg.org/ziglang/zig/raw/branch/master/lib/std/testing.zig"
+```
+
+### Fetch Allocator Interface
+
+```bash
+curl -sL "https://codeberg.org/ziglang/zig/raw/branch/master/lib/std/mem/Allocator.zig"
+```
+
+### Fetch Language Reference (Prose)
+
+```bash
+# Full language reference (large, ~500KB of text)
+pandoc -f html -t plain "https://ziglang.org/documentation/master/"
+
+# Pipe to head for specific sections
+pandoc -f html -t plain "https://ziglang.org/documentation/master/" | head -200
+```
+
+### List Standard Library Contents
+
+```bash
+# List all std lib modules via Codeberg API
+curl -sL "https://codeberg.org/api/v1/repos/ziglang/zig/contents/lib/std" | jq -r '.[].name'
+
+# List subdirectory contents
+curl -sL "https://codeberg.org/api/v1/repos/ziglang/zig/contents/lib/std/mem" | jq -r '.[].name'
+```
+
+### Fetch zig.guide Content
+
+```bash
+# Landing page and navigation
+pandoc -f html -t plain "https://zig.guide/"
+```
+
+## Documentation Sources
+
+| Source | URL Pattern | Notes |
+|--------|-------------|-------|
+| Std lib source | `codeberg.org/ziglang/zig/raw/branch/master/lib/std/<path>` | Most reliable; includes doc comments |
+| Language reference | `ziglang.org/documentation/master/` | Use pandoc; prose content |
+| zig.guide | `zig.guide/` | Beginner-friendly; use pandoc |
+| Codeberg API | `codeberg.org/api/v1/repos/ziglang/zig/contents/lib/std` | List directory contents |
+
+## Common Module Paths
+
+| Module | Path |
+|--------|------|
+| Allocator | `lib/std/mem/Allocator.zig` |
+| ArrayList | `lib/std/array_list.zig` |
+| HashMap | `lib/std/hash_map.zig` |
+| StringHashMap | `lib/std/hash/map.zig` |
+| File System | `lib/std/fs.zig` |
+| File | `lib/std/fs/File.zig` |
+| IO | `lib/std/Io.zig` |
+| Logging | `lib/std/log.zig` |
+| Testing | `lib/std/testing.zig` |
+| Debug | `lib/std/debug.zig` |
+| Heap | `lib/std/heap.zig` |
+| Build System | `lib/std/Build.zig` |
+| JSON | `lib/std/json.zig` |
+| HTTP | `lib/std/http.zig` |
+| Thread | `lib/std/Thread.zig` |
+| Process | `lib/std/process.zig` |
+
+## Version-Specific Documentation
+
+Replace `master` with version tag for stable releases:
+
+```bash
+# 0.14.0 release
+curl -sL "https://codeberg.org/ziglang/zig/raw/tag/0.14.0/lib/std/log.zig"
+
+# Language reference for specific version
+pandoc -f html -t plain "https://ziglang.org/documentation/0.14.0/"
+```
+
+## Searching Documentation
+
+### Search for specific function/type in std lib
+
+```bash
+# Search for function name across std lib
+curl -sL "https://codeberg.org/ziglang/zig/raw/branch/master/lib/std/<module>.zig" | grep -A5 "pub fn <name>"
+
+# Example: find allocator.create
+curl -sL "https://codeberg.org/ziglang/zig/raw/branch/master/lib/std/mem/Allocator.zig" | grep -A10 "pub fn create"
+```
+
+### Extract doc comments
+
+```bash
+# Module-level docs (//!)
+curl -sL "https://codeberg.org/ziglang/zig/raw/branch/master/lib/std/log.zig" | grep "^//!"
+
+# Function/type docs (///)
+curl -sL "https://codeberg.org/ziglang/zig/raw/branch/master/lib/std/mem/Allocator.zig" | grep -B1 "pub fn" | grep "///"
+```
+
+## Troubleshooting
+
+**Empty content from ziglang.org/documentation/master/std/:**
+- The std lib HTML docs are JavaScript-rendered; use raw Codeberg instead
+
+**pandoc fails:**
+- Some pages require JavaScript; fall back to curl + raw Codeberg
+- Check URL is correct (no trailing slash issues)
+
+**Rate limiting on Codeberg API:**
+- Use codeberg.org raw URLs directly instead of API
+- Cache frequently accessed content locally
+
+## References
+
+- Language Reference: https://ziglang.org/documentation/master/
+- Standard Library Source: https://codeberg.org/ziglang/zig/src/branch/master/lib/std
+- Zig Guide: https://zig.guide/
+- Release Tags: https://codeberg.org/ziglang/zig/tags
diff --git a/.claude/skills/discover-zig b/.claude/skills/discover-zig
new file mode 120000
index 0000000..024db6f
--- /dev/null
+++ b/.claude/skills/discover-zig
@@ -0,0 +1 @@
+../../.agents/skills/discover-zig
\ No newline at end of file
diff --git a/.claude/skills/zig-best-practices b/.claude/skills/zig-best-practices
new file mode 120000
index 0000000..5b05bbf
--- /dev/null
+++ b/.claude/skills/zig-best-practices
@@ -0,0 +1 @@
+../../.agents/skills/zig-best-practices
\ No newline at end of file
diff --git a/.claude/skills/zig-docs b/.claude/skills/zig-docs
new file mode 120000
index 0000000..b0ccd02
--- /dev/null
+++ b/.claude/skills/zig-docs
@@ -0,0 +1 @@
+../../.agents/skills/zig-docs
\ No newline at end of file
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3aad3a7..d818aa4 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -105,6 +105,7 @@ jobs:
 
       - name: Upload Playwright report
         if: always()
+        continue-on-error: true  # Don't fail job on upload timeout (self-hosted network issues)
         uses: actions/upload-artifact@v6
         with:
           name: playwright-report
@@ -113,6 +114,7 @@ jobs:
 
       - name: Upload test results
         if: always()
+        continue-on-error: true
         uses: actions/upload-artifact@v6
         with:
           name: playwright-results
@@ -172,6 +174,7 @@ jobs:
 
       - name: Upload coverage report
         if: always()
+        continue-on-error: true
         uses: actions/upload-artifact@v6
         with:
           name: vitest-coverage
@@ -191,6 +194,9 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
 
+      - name: Add Homebrew to PATH
+        run: echo "/opt/homebrew/bin:/opt/homebrew/sbin" >> $GITHUB_PATH
+
       - name: Setup Node.js
         uses: actions/setup-node@v6
         with:
@@ -199,6 +205,26 @@ jobs:
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@stable
 
+      - name: Setup Zig
+        uses: mlugg/setup-zig@v1
+        with:
+          version: 0.14.0
+
+      - name: Install TagLib (macOS)
+        run: |
+          if ! pkg-config --exists taglib_c 2>/dev/null; then
+            echo "Installing TagLib via Homebrew..."
+            brew install taglib
+          else
+            echo "TagLib already installed: $(pkg-config --modversion taglib_c)"
+          fi
+
+      - name: Verify build dependencies
+        run: |
+          echo "Zig: $(zig version)"
+          echo "TagLib: $(pkg-config --modversion taglib_c)"
+          echo "pkg-config path: $(pkg-config --variable=libdir taglib_c)"
+
       - name: Install frontend dependencies
         working-directory: ./app/frontend
         run: npm ci
@@ -208,8 +234,7 @@ jobs:
         run: npm run build
 
       - name: Check Rust build
-        working-directory: ./src-tauri
-        run: cargo check --all-features
+        run: cargo check --workspace --all-features
 
   # Rust backend tests with coverage
   rust-tests:
@@ -225,9 +250,23 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
 
+      - name: Add Homebrew to PATH
+        run: echo "/opt/homebrew/bin:/opt/homebrew/sbin" >> $GITHUB_PATH
+
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@stable
 
+      - name: Setup Zig
+        uses: mlugg/setup-zig@v1
+        with:
+          version: 0.14.0
+
+      - name: Install TagLib (macOS)
+        run: |
+          if ! pkg-config --exists taglib_c 2>/dev/null; then
+            brew install taglib
+          fi
+
       - name: Install cargo-tarpaulin
         run: |
           # Only install if not already cached
@@ -238,17 +277,17 @@ jobs:
           fi
 
       - name: Run Rust tests with coverage
-        working-directory: ./src-tauri
         run: |
-          cargo tarpaulin --out Html --out Json --output-dir coverage \
+          cargo tarpaulin --workspace --out Html --out Json --output-dir coverage \
             --ignore-tests --skip-clean \
-            --exclude-files 'src/commands/*' 'src/lib.rs' 'src/main.rs' 'src/watcher.rs' 'src/dialog.rs' 'src/media_keys.rs' \
+            --exclude-files 'crates/mt-tauri/src/commands/*' 'crates/mt-tauri/src/lib.rs' 'crates/mt-tauri/src/main.rs' 'crates/mt-tauri/src/watcher.rs' 'crates/mt-tauri/src/dialog.rs' 'crates/mt-tauri/src/media_keys.rs' \
             --fail-under 50
 
       - name: Upload coverage report
         if: always()
+        continue-on-error: true
         uses: actions/upload-artifact@v6
         with:
           name: rust-coverage
-          path: src-tauri/coverage/
+          path: coverage/
           retention-days: 30
diff --git a/.mcp.json b/.mcp.json
index bc78e0a..e6068e7 100644
--- a/.mcp.json
+++ b/.mcp.json
@@ -14,6 +14,10 @@
       "env": {
         "UV_PROJECT_ENVIRONMENT": "/Users/lance/git/screencap/.venv"
       }
+    },
+    "tauri-mcp": {
+      "command": "npx",
+      "args": ["-y", "@hypothesi/tauri-mcp-server"]
     }
   }
 }
diff --git a/AGENTS.md b/AGENTS.md
index b54333e..73a4cd0 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -349,6 +349,34 @@ Available mock fixtures:
 
 Each mock creates a mutable state object that persists for the test and tracks API calls for assertions.
 
+**E2E Test Authoring with MCP (Required Workflow):**
+
+When **drafting or debugging** Playwright E2E tests, you MUST use the MCP bridge for faster iteration and richer diagnostics. This requirement applies to test authoring only—test runs in CI use mocks.
+
+1. **Start the app with MCP enabled:**
+   ```bash
+   task tauri:dev:mcp
+   ```
+
+2. **Capture required diagnostics** during test development:
+   | Artifact | MCP Tool | Purpose |
+   |----------|----------|---------|
+   | Screenshots | `webview_screenshot` | Visual proof of UI state |
+   | Console logs | `read_logs` (source: console) | Capture JS errors/warnings |
+   | Network traces | `ipc_get_captured` | Verify IPC command payloads |
+   | IPC logs | `ipc_monitor` | Monitor backend communication |
+
+3. **Store evidence** under `/tmp/mt-e2e-evidence/<test-name>-<timestamp>/`
+   - On Windows: use `%TEMP%\mt-e2e-evidence\`
+   - Evidence is for debugging; no cleanup required
+
+4. **Validate before committing tests:**
+   - Confirm test passes with mocks (browser-only mode)
+   - Confirm test captures expected diagnostics
+   - Reference [MCP Bridge docs](docs/tauri-architecture.md#mcp-bridge-ai-agent-debugging) for full tool list
+
+**Note:** MCP is required for **drafting** tests only. Production test runs use mocks and do not require MCP.
+
 ### Code Coverage
 
 The project uses code coverage tools to track test effectiveness:
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new file mode 100644
index 0000000..9fe609b
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,7710 @@
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+# It is not intended for manual editing.
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+
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+ "tower-layer",
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a845482
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,19 @@
+[workspace]
+resolver = "2"
+members = ["crates/mt-core", "crates/mt-tauri"]
+
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+[profile.dev]
+split-debuginfo = "unpacked"  # macOS-specific: up to 70% faster incremental debug builds
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+
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+[profile.dev.build-override]
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+
+[profile.release]
+panic = "abort"
+codegen-units = 1
+lto = true
+opt-level = "s"
+strip = true
diff --git a/app/frontend/js/stores/ui.js b/app/frontend/js/stores/ui.js
index f6bdd28..cf95920 100644
--- a/app/frontend/js/stores/ui.js
+++ b/app/frontend/js/stores/ui.js
@@ -364,9 +364,9 @@ export function createUIStore(Alpine) {
           ],
         });
 
-         if (selected) {
-           const trackId = this.missingTrackPopover.track.id;
-           await api.library.locate(trackId, selected);
+        if (selected) {
+          const trackId = this.missingTrackPopover.track.id;
+          await api.library.locate(trackId, selected);
 
           this.missingTrackPopover.track.missing = false;
           this.missingTrackPopover.track.filepath = selected;
@@ -422,9 +422,9 @@ export function createUIStore(Alpine) {
           ],
         });
 
-         if (selected) {
-           const trackId = this.missingTrackModal.track.id;
-           await api.library.locate(trackId, selected);
+        if (selected) {
+          const trackId = this.missingTrackModal.track.id;
+          await api.library.locate(trackId, selected);
           this.toast('File located successfully', 'success');
           this.closeMissingTrackModal('located', selected);
         } else {
diff --git a/app/frontend/tests/fixtures/mock-library.js b/app/frontend/tests/fixtures/mock-library.js
index a013eba..f47633f 100644
--- a/app/frontend/tests/fixtures/mock-library.js
+++ b/app/frontend/tests/fixtures/mock-library.js
@@ -150,6 +150,56 @@ export function createLibraryState(options = {}) {
   };
 }
 
+/**
+ * Calculate search relevance score for a track
+ * @param {Object} track - Track object
+ * @param {string} query - Search query (lowercase)
+ * @returns {number} Relevance score (higher is more relevant)
+ */
+function calculateSearchScore(track, query) {
+  const title = (track.title || '').toLowerCase();
+  const artist = (track.artist || '').toLowerCase();
+  const album = (track.album || '').toLowerCase();
+
+  // Exact title match (highest priority)
+  if (title === query) {
+    return 100;
+  }
+
+  // Title starts with query
+  if (title.startsWith(query)) {
+    return 90;
+  }
+
+  // Partial title match (word boundary or contains)
+  if (title.includes(query)) {
+    return 80;
+  }
+
+  // Exact artist match
+  if (artist === query) {
+    return 70;
+  }
+
+  // Artist starts with or contains query
+  if (artist.includes(query)) {
+    return 60;
+  }
+
+  // Exact album match
+  if (album === query) {
+    return 50;
+  }
+
+  // Album starts with or contains query
+  if (album.includes(query)) {
+    return 40;
+  }
+
+  // No match (shouldn't happen if track passed filter)
+  return 0;
+}
+
 /**
  * Filter and sort tracks based on query parameters
  * @param {Array} tracks - All tracks
@@ -158,16 +208,29 @@ export function createLibraryState(options = {}) {
  */
 function filterAndSortTracks(tracks, params) {
   let result = [...tracks];
+  const hasSearch = params.search && params.search.trim().length > 0;
+  const query = hasSearch ? params.search.toLowerCase() : '';
 
   // Search filter
-  if (params.search) {
-    const query = params.search.toLowerCase();
+  if (hasSearch) {
     result = result.filter(
       (t) =>
         t.title?.toLowerCase().includes(query) ||
         t.artist?.toLowerCase().includes(query) ||
         t.album?.toLowerCase().includes(query)
     );
+
+    // Calculate and attach search scores for ranking
+    result = result.map((track) => ({
+      ...track,
+      _searchScore: calculateSearchScore(track, query),
+    }));
+
+    // Sort by search score descending (most relevant first)
+    result.sort((a, b) => b._searchScore - a._searchScore);
+
+    // Remove internal score property before returning
+    result = result.map(({ _searchScore, ...track }) => track);
   }
 
   // Artist filter
@@ -184,28 +247,30 @@ function filterAndSortTracks(tracks, params) {
     );
   }
 
-  // Sort
-  const sortBy = params.sort_by || params.sortBy || 'album';
-  const sortOrder = params.sort_order || params.sortOrder || 'asc';
-  const multiplier = sortOrder === 'desc' ? -1 : 1;
+  // Sort (only apply if not searching - search results are already ranked)
+  if (!hasSearch) {
+    const sortBy = params.sort_by || params.sortBy || 'album';
+    const sortOrder = params.sort_order || params.sortOrder || 'asc';
+    const multiplier = sortOrder === 'desc' ? -1 : 1;
 
-  result.sort((a, b) => {
-    let aVal = a[sortBy];
-    let bVal = b[sortBy];
+    result.sort((a, b) => {
+      let aVal = a[sortBy];
+      let bVal = b[sortBy];
 
-    // Handle null/undefined
-    if (aVal == null && bVal == null) return 0;
-    if (aVal == null) return 1;
-    if (bVal == null) return -1;
+      // Handle null/undefined
+      if (aVal == null && bVal == null) return 0;
+      if (aVal == null) return 1;
+      if (bVal == null) return -1;
 
-    // String comparison
-    if (typeof aVal === 'string') {
-      return multiplier * aVal.localeCompare(bVal);
-    }
+      // String comparison
+      if (typeof aVal === 'string') {
+        return multiplier * aVal.localeCompare(bVal);
+      }
 
-    // Numeric comparison
-    return multiplier * (aVal - bVal);
-  });
+      // Numeric comparison
+      return multiplier * (aVal - bVal);
+    });
+  }
 
   // Pagination
   const offset = parseInt(params.offset) || 0;
diff --git a/app/frontend/tests/library.spec.js b/app/frontend/tests/library.spec.js
index d7f3274..1ede55c 100644
--- a/app/frontend/tests/library.spec.js
+++ b/app/frontend/tests/library.spec.js
@@ -237,6 +237,155 @@ test.describe('Search Functionality', () => {
   });
 });
 
+test.describe('Search Result Ranking', () => {
+  test.beforeEach(async ({ page }) => {
+    const customTracks = [
+      {
+        id: 1,
+        title: 'Love',
+        artist: 'Some Band',
+        album: 'First Album',
+        duration: 180000,
+        track_number: 1,
+        disc_number: 1,
+        year: 2020,
+        genre: 'Pop',
+        filepath: '/music/track-1.mp3',
+        filename: 'track-1.mp3',
+      },
+      {
+        id: 2,
+        title: 'I Love Rock',
+        artist: 'Rock Stars',
+        album: 'Love Album',
+        duration: 200000,
+        track_number: 1,
+        disc_number: 1,
+        year: 2019,
+        genre: 'Rock',
+        filepath: '/music/track-2.mp3',
+        filename: 'track-2.mp3',
+      },
+      {
+        id: 3,
+        title: 'Dancing Queen',
+        artist: 'Love Band',
+        album: 'Greatest Hits',
+        duration: 220000,
+        track_number: 2,
+        disc_number: 1,
+        year: 2018,
+        genre: 'Disco',
+        filepath: '/music/track-3.mp3',
+        filename: 'track-3.mp3',
+      },
+      {
+        id: 4,
+        title: 'Summer Nights',
+        artist: 'Beach Boys',
+        album: 'Love Songs Collection',
+        duration: 190000,
+        track_number: 3,
+        disc_number: 1,
+        year: 2021,
+        genre: 'Pop',
+        filepath: '/music/track-4.mp3',
+        filename: 'track-4.mp3',
+      },
+      {
+        id: 5,
+        title: 'Lovely Day',
+        artist: 'Soul Singer',
+        album: 'Morning Vibes',
+        duration: 210000,
+        track_number: 1,
+        disc_number: 1,
+        year: 2017,
+        genre: 'Soul',
+        filepath: '/music/track-5.mp3',
+        filename: 'track-5.mp3',
+      },
+    ];
+    const state = createLibraryState({ tracks: customTracks });
+    await setupLibraryMocks(page, state);
+    await page.goto('/');
+    await page.setViewportSize({ width: 1624, height: 1057 });
+    await waitForAlpine(page);
+    await page.waitForSelector('[x-data="libraryBrowser"]', { state: 'visible' });
+
+    await page.evaluate(() => {
+      window.Alpine.store('ui').sortIgnoreWords = false;
+    });
+  });
+
+  test('exact title match ranks first', async ({ page }) => {
+    await page.waitForSelector('[data-track-id]', { state: 'visible' });
+
+    const searchInput = page.locator('input[placeholder="Search"]');
+    await searchInput.fill('love');
+    await page.waitForTimeout(500);
+
+    const trackRows = page.locator('[data-track-id]');
+    const count = await trackRows.count();
+    expect(count).toBeGreaterThan(0);
+
+    const firstTrackId = await trackRows.first().getAttribute('data-track-id');
+    expect(firstTrackId).toBe('1');
+  });
+
+  test('artist match ranks appropriately', async ({ page }) => {
+    await page.waitForSelector('[data-track-id]', { state: 'visible' });
+
+    const searchInput = page.locator('input[placeholder="Search"]');
+    await searchInput.fill('love band');
+    await page.waitForTimeout(500);
+
+    const trackRows = page.locator('[data-track-id]');
+    const count = await trackRows.count();
+    expect(count).toBeGreaterThan(0);
+
+    const firstTrackId = await trackRows.first().getAttribute('data-track-id');
+    expect(firstTrackId).toBe('3');
+  });
+
+  test('partial matches appear after exact matches', async ({ page }) => {
+    await page.waitForSelector('[data-track-id]', { state: 'visible' });
+
+    const searchInput = page.locator('input[placeholder="Search"]');
+    await searchInput.fill('love');
+    await page.waitForTimeout(500);
+
+    const trackRows = page.locator('[data-track-id]');
+    const trackIds = [];
+    const count = await trackRows.count();
+    for (let i = 0; i < count; i++) {
+      trackIds.push(await trackRows.nth(i).getAttribute('data-track-id'));
+    }
+
+    expect(trackIds[0]).toBe('1');
+
+    const lovelyDayIndex = trackIds.indexOf('5');
+    const iLoveRockIndex = trackIds.indexOf('2');
+    expect(lovelyDayIndex).toBeGreaterThan(0);
+    expect(iLoveRockIndex).toBeGreaterThan(0);
+  });
+
+  test('search with multiple terms returns expected order', async ({ page }) => {
+    await page.waitForSelector('[data-track-id]', { state: 'visible' });
+
+    const searchInput = page.locator('input[placeholder="Search"]');
+    await searchInput.fill('rock');
+    await page.waitForTimeout(500);
+
+    const trackRows = page.locator('[data-track-id]');
+    const count = await trackRows.count();
+    expect(count).toBeGreaterThan(0);
+
+    const firstTrackId = await trackRows.first().getAttribute('data-track-id');
+    expect(firstTrackId).toBe('2');
+  });
+});
+
 test.describe('Sorting', () => {
   test.beforeEach(async ({ page }) => {
     const libraryState = createLibraryState();
diff --git a/app/frontend/tests/sidebar.spec.js b/app/frontend/tests/sidebar.spec.js
index c312e24..b906e92 100644
--- a/app/frontend/tests/sidebar.spec.js
+++ b/app/frontend/tests/sidebar.spec.js
@@ -684,6 +684,56 @@ test.describe('Playlist Feature Parity (task-150)', () => {
     expect(result.hasGetReorderClass).toBe(true);
     expect(result.hasIsDragging).toBe(true);
   });
+
+  test('should rename playlist via context menu click', async ({ page }) => {
+    const playlist1 = page.locator('[data-testid="sidebar-playlist-1"]');
+    await playlist1.click({ button: 'right' });
+
+    const renameOption = page.locator('[data-testid="playlist-rename"]');
+    await expect(renameOption).toBeVisible();
+    await renameOption.click();
+
+    const renameInput = page.locator('[data-testid="playlist-rename-input"]');
+    await expect(renameInput).toBeVisible();
+    await expect(renameInput).toBeFocused();
+
+    await renameInput.fill('Context Menu Renamed');
+    await renameInput.press('Enter');
+
+    await page.waitForTimeout(300);
+
+    const renameCalls = findApiCalls(playlistState, 'PUT', '/playlists/1');
+    expect(renameCalls.length).toBeGreaterThan(0);
+    expect(renameCalls[0].body.name).toBe('Context Menu Renamed');
+  });
+
+  test('renamed playlist persists after page reload (mocked)', async ({ page }) => {
+    const playlist1 = page.locator('[data-testid="sidebar-playlist-1"]');
+    await playlist1.click({ button: 'right' });
+
+    const renameOption = page.locator('[data-testid="playlist-rename"]');
+    await renameOption.click();
+
+    const renameInput = page.locator('[data-testid="playlist-rename-input"]');
+    await renameInput.fill('Persistent Name');
+    await renameInput.press('Enter');
+
+    await page.waitForTimeout(300);
+
+    const renameCalls = findApiCalls(playlistState, 'PUT', '/playlists/1');
+    expect(renameCalls.length).toBeGreaterThan(0);
+
+    playlistState.playlists[0].name = 'Persistent Name';
+
+    await page.reload();
+    await setupPlaylistMocks(page, playlistState);
+    await page.goto('/');
+    await waitForAlpine(page);
+    await page.waitForSelector('aside[x-data="sidebar"]', { state: 'visible' });
+
+    const renamedPlaylist = page.locator('[data-testid="sidebar-playlist-1"]');
+    await expect(renamedPlaylist).toContainText('Persistent Name');
+  });
 });
 
 test.describe('Sidebar Responsiveness', () => {
diff --git a/app/frontend/tests/stores.spec.js b/app/frontend/tests/stores.spec.js
index f5d99c4..fa6092b 100644
--- a/app/frontend/tests/stores.spec.js
+++ b/app/frontend/tests/stores.spec.js
@@ -307,33 +307,26 @@ test.describe('Library Store', () => {
     expect(libraryStore.loading).toBe(false);
   });
 
-  test('should filter tracks based on search', async ({ page }) => {
-    // Add mock tracks
+  test('should apply ignore-words filter via applyFilters', async ({ page }) => {
+    // Add mock tracks with "The" prefix to test ignore-words normalization
     await page.evaluate(() => {
-      window.Alpine.store('library').tracks = [
-        { id: 'track-1', title: 'Hello World', artist: 'Artist A' },
-        { id: 'track-2', title: 'Goodbye Moon', artist: 'Artist B' },
-        { id: 'track-3', title: 'Hello Again', artist: 'Artist A' },
+      const store = window.Alpine.store('library');
+      store.tracks = [
+        { id: 'track-1', title: 'The Beatles Song', artist: 'The Beatles', album: 'Abbey Road' },
+        { id: 'track-2', title: 'Bohemian Rhapsody', artist: 'Queen', album: 'A Night at the Opera' },
+        { id: 'track-3', title: 'A Hard Days Night', artist: 'The Beatles', album: 'A Hard Days Night' },
       ];
+      // Call applyFilters to populate filteredTracks
+      store.applyFilters();
     });
 
-    // Set search query
-    await setAlpineStoreProperty(page, 'library', 'searchQuery', 'hello');
-
-    // Trigger search (if method exists)
-    try {
-      await callAlpineStoreMethod(page, 'library', 'search', 'hello');
-    } catch (e) {
-      // Method might not exist, search might be reactive
-    }
-
-    // Wait a moment for filtering
-    await page.waitForTimeout(500);
-
-    // Verify filtered tracks (this depends on implementation)
+    // Verify filteredTracks is populated
     const libraryStore = await getAlpineStore(page, 'library');
-    // Should have tracks with "hello" in title or all tracks if filtering is done elsewhere
-    expect(libraryStore.tracks.length).toBeGreaterThan(0);
+    expect(libraryStore.filteredTracks.length).toBe(3);
+    // Verify tracks are present (applyFilters copies tracks to filteredTracks)
+    expect(libraryStore.filteredTracks.map((t) => t.id)).toContain('track-1');
+    expect(libraryStore.filteredTracks.map((t) => t.id)).toContain('track-2');
+    expect(libraryStore.filteredTracks.map((t) => t.id)).toContain('track-3');
   });
 });
 
diff --git a/backlog/tasks/task-177 - Expose-additional-metadata-columns-total-tracks-disc-year-genre.md b/backlog/tasks/task-177 - Expose-additional-metadata-columns-total-tracks-disc-year-genre.md
index 776c412..0cb5275 100644
--- a/backlog/tasks/task-177 - Expose-additional-metadata-columns-total-tracks-disc-year-genre.md	
+++ b/backlog/tasks/task-177 - Expose-additional-metadata-columns-total-tracks-disc-year-genre.md	
@@ -1,10 +1,10 @@
 ---
 id: task-177
 title: 'Expose additional metadata columns: total tracks, disc #, year, genre'
-status: In Progress
+status: To Do
 assignee: []
 created_date: '2026-01-20 07:17'
-updated_date: '2026-01-27 22:48'
+updated_date: '2026-01-28 08:16'
 labels:
   - frontend
   - ui
diff --git a/backlog/tasks/task-208 - Cache-Last.fm-loved-tracks-for-automatic-favoriting-of-future-library-additions.md b/backlog/tasks/task-208 - Cache-Last.fm-loved-tracks-for-automatic-favoriting-of-future-library-additions.md
index b5a917e..9efcb29 100644
--- a/backlog/tasks/task-208 - Cache-Last.fm-loved-tracks-for-automatic-favoriting-of-future-library-additions.md	
+++ b/backlog/tasks/task-208 - Cache-Last.fm-loved-tracks-for-automatic-favoriting-of-future-library-additions.md	
@@ -3,10 +3,10 @@ id: task-208
 title: >-
   Cache Last.fm loved tracks for automatic favoriting of future library
   additions
-status: In Progress
+status: To Do
 assignee: []
 created_date: '2026-01-25 23:14'
-updated_date: '2026-01-28 05:21'
+updated_date: '2026-01-28 08:16'
 labels:
   - lastfm
   - database
diff --git a/backlog/tasks/task-229 - E2E-Search-result-ranking-tests.md b/backlog/tasks/task-229 - E2E-Search-result-ranking-tests.md
index f8e5ac7..72c6903 100644
--- a/backlog/tasks/task-229 - E2E-Search-result-ranking-tests.md	
+++ b/backlog/tasks/task-229 - E2E-Search-result-ranking-tests.md	
@@ -1,10 +1,10 @@
 ---
 id: task-229
 title: 'E2E: Search result ranking tests'
-status: In Progress
+status: Done
 assignee: []
 created_date: '2026-01-28 05:40'
-updated_date: '2026-01-28 08:13'
+updated_date: '2026-01-28 21:23'
 labels:
   - e2e
   - library
@@ -23,8 +23,8 @@ Add Playwright E2E tests for search result ranking logic. Search tests exist but
 
 ## Acceptance Criteria
 <!-- AC:BEGIN -->
-- [ ] #1 Exact title match ranks first
-- [ ] #2 Artist match ranks appropriately
-- [ ] #3 Partial matches appear after exact matches
-- [ ] #4 Search with multiple terms returns expected order
+- [x] #1 Exact title match ranks first
+- [x] #2 Artist match ranks appropriately
+- [x] #3 Partial matches appear after exact matches
+- [x] #4 Search with multiple terms returns expected order
 <!-- AC:END -->
diff --git a/backlog/tasks/task-230 - E2E-Playlist-rename-and-delete-confirmation-tests.md b/backlog/tasks/task-230 - E2E-Playlist-rename-and-delete-confirmation-tests.md
index 88f3c26..29e86e6 100644
--- a/backlog/tasks/task-230 - E2E-Playlist-rename-and-delete-confirmation-tests.md	
+++ b/backlog/tasks/task-230 - E2E-Playlist-rename-and-delete-confirmation-tests.md	
@@ -1,10 +1,10 @@
 ---
 id: task-230
 title: 'E2E: Playlist rename and delete confirmation tests'
-status: In Progress
+status: Done
 assignee: []
 created_date: '2026-01-28 05:40'
-updated_date: '2026-01-28 08:13'
+updated_date: '2026-01-28 21:25'
 labels:
   - e2e
   - playlists
@@ -22,8 +22,8 @@ Add Playwright E2E tests for playlist rename and delete operations with confirma
 
 ## Acceptance Criteria
 <!-- AC:BEGIN -->
-- [ ] #1 Rename playlist via context menu
-- [ ] #2 Rename persists after refresh (mocked)
-- [ ] #3 Delete shows confirmation dialog
-- [ ] #4 Cancel delete preserves playlist
+- [x] #1 Rename playlist via context menu
+- [x] #2 Rename persists after refresh (mocked)
+- [x] #3 Delete shows confirmation dialog
+- [x] #4 Cancel delete preserves playlist
 <!-- AC:END -->
diff --git a/backlog/tasks/task-237 - Zig-migration-validate-FFI-with-real-audio-files.md b/backlog/tasks/task-237 - Zig-migration-validate-FFI-with-real-audio-files.md
new file mode 100644
index 0000000..9b386d1
--- /dev/null
+++ b/backlog/tasks/task-237 - Zig-migration-validate-FFI-with-real-audio-files.md	
@@ -0,0 +1,40 @@
+---
+id: task-237
+title: 'Zig migration: validate FFI with real audio files'
+status: Done
+assignee: []
+created_date: '2026-01-28 23:22'
+updated_date: '2026-01-29 04:13'
+labels: []
+dependencies: []
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Verify Zig FFI functions against real audio samples to confirm cross-language behavior matches expectations and document results for migration readiness.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 FFI integration tests include real audio sample files and pass locally
+- [x] #2 Results (formats tested and outcomes) are documented for future reference
+- [x] #3 No regressions in existing Rust or Zig test suites
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+✅ Created real audio test fixtures (MP3, FLAC, WAV, M4A, OGG) in src-tauri/tests/fixtures/
+
+✅ Added 10 comprehensive FFI integration tests covering metadata extraction, fingerprinting, and batch processing
+
+✅ All 10 new tests pass successfully with real audio files
+
+✅ Verified no regressions: 535 Rust tests + 213 Vitest tests all passing
+
+✅ Documented results in docs/ffi-validation-results.md with detailed format comparison table
+
+Fixed missing CStr and CString imports in ffi.rs test module
+<!-- SECTION:NOTES:END -->
diff --git a/backlog/tasks/task-238 - Zig-migration-scanner-artwork-cache-module.md b/backlog/tasks/task-238 - Zig-migration-scanner-artwork-cache-module.md
new file mode 100644
index 0000000..4b6a2e6
--- /dev/null
+++ b/backlog/tasks/task-238 - Zig-migration-scanner-artwork-cache-module.md	
@@ -0,0 +1,54 @@
+---
+id: task-238
+title: 'Zig migration: scanner artwork cache module'
+status: Done
+assignee: []
+created_date: '2026-01-28 23:22'
+updated_date: '2026-01-29 05:23'
+labels: []
+dependencies: []
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Migrate scanner artwork cache logic to Zig while preserving cache behavior and Rust-facing API expectations.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Artwork cache behavior (hits/misses/eviction) matches current Rust behavior on sample data
+- [x] #2 Rust scanner uses Zig artwork cache via FFI without user-visible behavior changes
+- [x] #3 Existing automated tests continue to pass
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+✅ Skeleton implementation complete
+
+Created zig-core/src/scanner/artwork_cache.zig with full structure
+
+Defined Artwork extern struct for FFI
+
+Defined ArtworkCache with LRU methods (init, deinit, getOrLoad, invalidate, clear, len)
+
+Added commented FFI exports in ffi.zig
+
+All methods have TODO markers for implementation
+
+Tests stubbed with error.SkipZigTest
+
+Matches Rust behavior spec: 100-item LRU cache, thread-safe, caches None values
+
+**Full Implementation Complete (2026-01-28):**
+- Implemented LRU cache with doubly-linked list + HashMap
+- Thread-safe with mutex (two-phase locking pattern)
+- Caches both Some and None values (critical behavior)
+- Folder artwork extraction working (embedded stays in Rust via lofty)
+- 11 Zig unit tests passing
+- All acceptance criteria met
+
+**Completed (2026-01-28):** All 118 Zig tests passing. Full LRU cache with thread-safe mutex, caches None values, folder artwork extraction implemented.
+<!-- SECTION:NOTES:END -->
diff --git a/backlog/tasks/task-239 - Zig-migration-scanner-inventory-module.md b/backlog/tasks/task-239 - Zig-migration-scanner-inventory-module.md
new file mode 100644
index 0000000..bb40308
--- /dev/null
+++ b/backlog/tasks/task-239 - Zig-migration-scanner-inventory-module.md	
@@ -0,0 +1,46 @@
+---
+id: task-239
+title: 'Zig migration: scanner inventory module'
+status: Done
+assignee: []
+created_date: '2026-01-28 23:23'
+updated_date: '2026-01-29 05:23'
+labels: []
+dependencies: []
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Migrate directory inventory scanning to Zig and route Rust scanner inventory calls through Zig FFI while preserving existing file discovery behavior.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Inventory scan results (file inclusion/exclusion) match current behavior on sample libraries
+- [x] #2 Rust scanner inventory path uses Zig FFI without user-visible changes
+- [x] #3 Existing automated tests continue to pass
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+✅ Skeleton implementation complete
+
+Created zig-core/src/scanner/inventory.zig
+
+Defined ScanResults and InventoryScanner structs
+
+Stubbed methods: init, deinit, scanDirectory, getFiles
+
+Includes recursive traversal logic outline
+
+Audio file filtering via isAudioFile
+
+Exclusion pattern support
+
+Statistics tracking (files found/excluded, directories scanned, errors)
+
+**Completed (2026-01-28):** Implemented InventoryScanner with recursive directory traversal, audio file filtering, fingerprint collection (mtime_ns + size), and classification (added/modified/unchanged/deleted). Progress callbacks after every file. All Zig tests passing.
+<!-- SECTION:NOTES:END -->
diff --git a/backlog/tasks/task-240 - Zig-migration-scanner-scan-orchestration.md b/backlog/tasks/task-240 - Zig-migration-scanner-scan-orchestration.md
new file mode 100644
index 0000000..67ee2a9
--- /dev/null
+++ b/backlog/tasks/task-240 - Zig-migration-scanner-scan-orchestration.md	
@@ -0,0 +1,48 @@
+---
+id: task-240
+title: 'Zig migration: scanner scan orchestration'
+status: Done
+assignee: []
+created_date: '2026-01-28 23:23'
+updated_date: '2026-01-29 05:23'
+labels: []
+dependencies:
+  - task-239
+  - task-238
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Migrate scanner scan orchestration to Zig, integrating inventory, fingerprinting, and artwork cache while keeping Rust dispatch intact.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Scan orchestration produces the same results and progress events for sample libraries
+- [x] #2 Rust scan entry points dispatch to Zig without user-visible changes
+- [x] #3 Existing automated tests continue to pass
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+✅ Skeleton implementation complete
+
+Created zig-core/src/scanner/orchestration.zig
+
+Defined ScanProgress event struct and ProgressCallback type
+
+Defined ScanOrchestrator with pipeline coordination
+
+Stubbed methods: init, deinit, setProgressCallback, scanLibrary
+
+Pipeline phases: inventory → fingerprint → metadata → complete
+
+Progress events emit current/total/filepath
+
+Dependencies: Requires tasks 238, 239 for full implementation
+
+**Completed (2026-01-28):** Implemented ScanOrchestrator with 2-phase pipeline (inventory → metadata extraction). Progress events for each phase. Metadata extraction only for added/modified files. All Zig tests passing.
+<!-- SECTION:NOTES:END -->
diff --git a/backlog/tasks/task-241 - Zig-migration-DB-models-and-schema.md b/backlog/tasks/task-241 - Zig-migration-DB-models-and-schema.md
new file mode 100644
index 0000000..a0bd93c
--- /dev/null
+++ b/backlog/tasks/task-241 - Zig-migration-DB-models-and-schema.md	
@@ -0,0 +1,46 @@
+---
+id: task-241
+title: 'Zig migration: DB models and schema'
+status: Done
+assignee: []
+created_date: '2026-01-28 23:23'
+updated_date: '2026-01-29 05:23'
+labels: []
+dependencies: []
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Move DB models and schema definitions to Zig as the source of truth while keeping Rust integration stable.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Schema definitions and models in Zig match current Rust structures
+- [x] #2 Database initialization/migrations remain unchanged from a user perspective
+- [x] #3 Existing automated tests continue to pass
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+✅ Skeleton implementation complete
+
+Created zig-core/src/db/models.zig
+
+Defined extern structs: Track, Playlist, QueueItem, Setting
+
+All use fixed-size buffers for FFI safety
+
+Added SCHEMA_SQL.tracks_table CREATE statement
+
+Schema version: 1
+
+Models match Rust struct layouts
+
+TODO: Add schemas for playlists, queue, settings, scrobbles, watched_folders
+
+**Completed (2026-01-28):** All FFI-safe extern structs implemented with fixed-size buffers. Track, Playlist, QueueItem, Setting models complete with getter/setter methods. SCHEMA_SQL with all table definitions. All Zig tests passing.
+<!-- SECTION:NOTES:END -->
diff --git a/backlog/tasks/task-242 - Zig-migration-DB-library-queries.md b/backlog/tasks/task-242 - Zig-migration-DB-library-queries.md
new file mode 100644
index 0000000..78e5a89
--- /dev/null
+++ b/backlog/tasks/task-242 - Zig-migration-DB-library-queries.md	
@@ -0,0 +1,45 @@
+---
+id: task-242
+title: 'Zig migration: DB library queries'
+status: Done
+assignee: []
+created_date: '2026-01-28 23:23'
+updated_date: '2026-01-29 05:23'
+labels: []
+dependencies:
+  - task-241
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Migrate library query logic to Zig while preserving existing query behavior and results.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Library query results match current behavior on sample data
+- [x] #2 Rust callers use Zig via FFI without user-visible changes
+- [x] #3 Existing automated tests continue to pass
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+✅ Skeleton implementation complete
+
+Created zig-core/src/db/library.zig
+
+Stubbed query functions: getAllTracks, getTrackById, searchTracks, upsertTrack, deleteTrack
+
+Uses DbHandle opaque type for connection
+
+Returns QueryResults with allocator-based memory management
+
+Full-text search across title/artist/album
+
+Dependencies: Requires task 241 complete for models
+
+**Completed (2026-01-28):** Implemented SearchParams, SortField, SortOrder, TrackQueryResult, SingleTrackResult, UpsertResult. LibraryManager with buildSearchFilter. validateTrack and normalizeTrackStrings (with temp buffer fix for memcpy aliasing). SQLite operations stay in Rust via FFI. All Zig tests passing.
+<!-- SECTION:NOTES:END -->
diff --git a/backlog/tasks/task-243 - Zig-migration-DB-queue-playlists-favorites.md b/backlog/tasks/task-243 - Zig-migration-DB-queue-playlists-favorites.md
new file mode 100644
index 0000000..7602d9b
--- /dev/null
+++ b/backlog/tasks/task-243 - Zig-migration-DB-queue-playlists-favorites.md	
@@ -0,0 +1,45 @@
+---
+id: task-243
+title: 'Zig migration: DB queue/playlists/favorites'
+status: Done
+assignee: []
+created_date: '2026-01-28 23:23'
+updated_date: '2026-01-29 05:23'
+labels: []
+dependencies:
+  - task-241
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Migrate queue, playlist, and favorites database operations to Zig while preserving current behaviors.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Queue, playlist, and favorites behaviors match current Rust implementations
+- [x] #2 Rust callers use Zig via FFI without user-visible changes
+- [x] #3 Existing automated tests continue to pass
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+✅ Skeleton implementation complete
+
+Created zig-core/src/db/queue.zig
+
+Stubbed queue operations: getQueue, addToQueue, removeFromQueue, clearQueue
+
+Stubbed playlist operations: getAllPlaylists, createPlaylist, addToPlaylist
+
+Stubbed favorites operations: getFavorites, toggleFavorite
+
+Queue maintains position ordering
+
+Dependencies: Requires task 241 complete for models
+
+**Completed (2026-01-28):** Implemented QueueItemFull, QueueSnapshot with RepeatMode, PlaylistInfo, PlaylistQueryResult, FavoriteEntry, FavoritesQueryResult. QueueManager with calculateMovePositions and buildShuffleOrder (Fisher-Yates algorithm, current track at position 0). All Zig tests passing.
+<!-- SECTION:NOTES:END -->
diff --git a/backlog/tasks/task-244 - Zig-migration-DB-settings-scrobble-watched.md b/backlog/tasks/task-244 - Zig-migration-DB-settings-scrobble-watched.md
new file mode 100644
index 0000000..d87ed3d
--- /dev/null
+++ b/backlog/tasks/task-244 - Zig-migration-DB-settings-scrobble-watched.md	
@@ -0,0 +1,47 @@
+---
+id: task-244
+title: 'Zig migration: DB settings/scrobble/watched'
+status: Done
+assignee: []
+created_date: '2026-01-28 23:23'
+updated_date: '2026-01-29 05:23'
+labels: []
+dependencies:
+  - task-241
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Migrate settings, scrobble tracking, and watched folders database operations to Zig while preserving current behaviors.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Settings, scrobble, and watched folder behaviors match current Rust implementations
+- [x] #2 Rust callers use Zig via FFI without user-visible changes
+- [x] #3 Existing automated tests continue to pass
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+✅ Skeleton implementation complete
+
+Created zig-core/src/db/settings.zig
+
+Stubbed settings operations: getSetting, setSetting, deleteSetting
+
+Stubbed scrobble tracking: recordPlay, getPendingScrobbles, markScrobbleSubmitted
+
+Stubbed watched folders: getWatchedFolders, addWatchedFolder, removeWatchedFolder, updateWatchedFolderMode
+
+Defined ScrobbleRecord and WatchedFolder extern structs
+
+Watched folders support 3 scan modes: manual, auto, watch
+
+Dependencies: Requires task 241 complete for models
+
+**Completed (2026-01-28):** Implemented SettingEntry, SettingResult, SettingKeys enum, ScrobbleRecord, ScrobbleQueryResult, WatchedFolder, WatchedFolderResult, ScanMode. SettingsManager and ScrobbleManager with isScrobbleEligible (4-minute OR 50% rule). All Zig tests passing.
+<!-- SECTION:NOTES:END -->
diff --git a/backlog/tasks/task-245 - Zig-migration-Last.fm-signature-and-types.md b/backlog/tasks/task-245 - Zig-migration-Last.fm-signature-and-types.md
new file mode 100644
index 0000000..4605031
--- /dev/null
+++ b/backlog/tasks/task-245 - Zig-migration-Last.fm-signature-and-types.md	
@@ -0,0 +1,46 @@
+---
+id: task-245
+title: 'Zig migration: Last.fm signature and types'
+status: Done
+assignee: []
+created_date: '2026-01-28 23:23'
+updated_date: '2026-01-29 05:23'
+labels: []
+dependencies: []
+priority: low
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Migrate Last.fm signature generation and types to Zig while preserving API behavior.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Signature generation outputs match current Rust implementation for known fixtures
+- [x] #2 Last.fm types in Zig match existing Rust structures
+- [x] #3 Existing automated tests continue to pass
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+✅ Skeleton implementation complete
+
+Created zig-core/src/lastfm/types.zig
+
+Defined Method enum: track_updateNowPlaying, track_scrobble, auth_getSession, user_getInfo
+
+Defined Params struct with StringHashMap
+
+Defined ScrobbleRequest and NowPlayingRequest extern structs
+
+Stubbed generateSignature: sort params → concatenate → append secret → MD5
+
+Fixed-size buffers (512 bytes) for artist/track/album
+
+Matches Last.fm API v2.0 specification
+
+**Completed (2026-01-28):** Implemented Method enum with toString(), Params with StringHashMap, ScrobbleRequest and NowPlayingRequest extern structs, generateSignature (sort params → concatenate → append secret → MD5 → hex). All Zig tests passing.
+<!-- SECTION:NOTES:END -->
diff --git a/backlog/tasks/task-246 - Zig-migration-Last.fm-client-config-rate-limiter.md b/backlog/tasks/task-246 - Zig-migration-Last.fm-client-config-rate-limiter.md
new file mode 100644
index 0000000..3fad41a
--- /dev/null
+++ b/backlog/tasks/task-246 - Zig-migration-Last.fm-client-config-rate-limiter.md	
@@ -0,0 +1,49 @@
+---
+id: task-246
+title: 'Zig migration: Last.fm client/config/rate limiter'
+status: Done
+assignee: []
+created_date: '2026-01-28 23:23'
+updated_date: '2026-01-29 05:23'
+labels: []
+dependencies:
+  - task-245
+priority: low
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Migrate Last.fm client, configuration, and rate limiter logic to Zig while preserving API behavior and error handling.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Client behavior (requests/responses, error handling) matches current Rust implementation on fixtures
+- [x] #2 Rate limiting behavior matches current Rust implementation
+- [x] #3 Existing automated tests continue to pass
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+✅ Skeleton implementation complete
+
+Created zig-core/src/lastfm/client.zig
+
+Defined RateLimiter struct with waitForSlot method
+
+Defined Config and Client structs
+
+Stubbed client methods: init, deinit, setSessionKey, scrobble, updateNowPlaying, makeRequest
+
+Rate limiter enforces 5 requests/second (Last.fm API limit)
+
+Thread-safe via mutex
+
+HTTP requests to be implemented via std.http
+
+Dependencies: Requires task 245 complete for signature generation
+
+**Completed (2026-01-28):** Implemented RateLimiter (mutex-protected, 5 req/sec default), Client with buildScrobbleRequest and buildNowPlayingRequest, BuiltRequest and ApiResponse FFI-safe types, URL encoding functions. All Zig tests passing.
+<!-- SECTION:NOTES:END -->
diff --git a/backlog/tasks/task-247 - Stabilize-flaky-Playwright-E2E-tests-drag-and-drop-library-search.md b/backlog/tasks/task-247 - Stabilize-flaky-Playwright-E2E-tests-drag-and-drop-library-search.md
new file mode 100644
index 0000000..cbcdb8d
--- /dev/null
+++ b/backlog/tasks/task-247 - Stabilize-flaky-Playwright-E2E-tests-drag-and-drop-library-search.md	
@@ -0,0 +1,27 @@
+---
+id: task-247
+title: Stabilize flaky Playwright E2E tests (drag-and-drop + library search)
+status: In Progress
+assignee: []
+created_date: '2026-01-29 04:07'
+updated_date: '2026-01-29 08:31'
+labels:
+  - testing
+  - playwright
+  - flaky
+dependencies: []
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Reduce Playwright flakiness by addressing timing/readiness issues in the drag-and-drop multi-select test and the library store search test so they pass reliably in CI.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [ ] #1 Drag-and-drop multi-select test passes reliably on WebKit by waiting for the library list to be rendered and stable before clicking.
+- [ ] #2 Library store search test consistently loads non-empty tracks (or validates expected empty state) without timing-related failures.
+- [ ] #3 Flaky failures are eliminated in CI runs for these tests (no intermittent timeouts or zero-track assertions).
+<!-- AC:END -->
diff --git a/backlog/tasks/task-248 - Debug-and-stabilize-Zig-CI-workflow-for-self-hosted-macOS-runner.md b/backlog/tasks/task-248 - Debug-and-stabilize-Zig-CI-workflow-for-self-hosted-macOS-runner.md
new file mode 100644
index 0000000..3634519
--- /dev/null
+++ b/backlog/tasks/task-248 - Debug-and-stabilize-Zig-CI-workflow-for-self-hosted-macOS-runner.md	
@@ -0,0 +1,44 @@
+---
+id: task-248
+title: Debug and stabilize Zig CI workflow for self-hosted macOS runner
+status: In Progress
+assignee: []
+created_date: '2026-01-29 08:31'
+updated_date: '2026-01-29 08:31'
+labels:
+  - ci
+  - zig
+  - infrastructure
+dependencies: []
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+The CI workflow for the zig-migration branch is experiencing issues on the self-hosted macOS ARM64 runner. Several fixes have been applied but the workflow may still need additional debugging.
+
+## Context
+- Branch: `zig-migration`
+- Runner: Self-hosted macOS ARM64 (M4 Mac Mini)
+- SSH access: `ssh mini`
+
+## Issues Encountered
+1. **Path issue**: Workflow referenced `./src-tauri` which no longer exists after workspace restructuring → Fixed with `--workspace` flag
+2. **Zig not installed**: Added `mlugg/setup-zig@v1` action
+3. **TagLib not installed**: Added `brew install taglib` step
+4. **pkg-config not found**: PATH didn't include `/opt/homebrew/bin` → Added to workflow env
+5. **pkg-config not installed**: Had to manually install via `brew install pkg-config`
+
+## Current State
+- Workflow file: `.github/workflows/test.yml`
+- Last commit: `8a92762` - Added Homebrew to PATH
+- PR: https://github.com/pythoninthegrass/mt/pull/18
+
+## Tasks
+- [ ] Verify CI passes after PATH fix
+- [ ] Consider pre-installing dependencies on runner vs installing in workflow
+- [ ] Add Playwright tests job PATH fix if needed
+- [ ] Document runner requirements (Zig, TagLib, pkg-config)
+- [ ] Consider caching Homebrew packages for faster CI
+<!-- SECTION:DESCRIPTION:END -->
diff --git a/crates/mt-core/Cargo.toml b/crates/mt-core/Cargo.toml
new file mode 100644
index 0000000..d489326
--- /dev/null
+++ b/crates/mt-core/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "mt-core"
+version = "0.1.0"
+description = "Core library for mt music player - Zig FFI and pure logic"
+authors = ["pythoninthegrass"]
+edition = "2024"
+
+[lib]
+name = "mt_core"
+crate-type = ["rlib"]
+
+[build-dependencies]
+pkg-config = "0.3"
+
+[dependencies]
+# Serialization (for types shared across FFI boundary)
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+# Error handling
+thiserror = "2"
diff --git a/crates/mt-core/build.rs b/crates/mt-core/build.rs
new file mode 100644
index 0000000..324e898
--- /dev/null
+++ b/crates/mt-core/build.rs
@@ -0,0 +1,30 @@
+use std::path::PathBuf;
+
+fn main() {
+    // Get absolute path to workspace root from CARGO_MANIFEST_DIR
+    let manifest_dir = PathBuf::from(std::env::var("CARGO_MANIFEST_DIR").unwrap());
+    let workspace_root = manifest_dir.parent().unwrap().parent().unwrap();
+    let zig_core_dir = workspace_root.join("zig-core");
+    let zig_lib_dir = zig_core_dir.join("zig-out").join("lib");
+
+    // Build Zig library first
+    let status = std::process::Command::new("zig")
+        .args(["build", "-Doptimize=ReleaseFast"])
+        .current_dir(&zig_core_dir)
+        .status()
+        .expect("failed to build zig-core");
+
+    assert!(status.success(), "zig-core build failed");
+
+    // Link the static library using absolute path
+    println!("cargo:rustc-link-search=native={}", zig_lib_dir.display());
+    println!("cargo:rustc-link-lib=static=mtcore");
+
+    // Link TagLib (required by zig-core) via pkg-config
+    pkg_config::Config::new()
+        .probe("taglib_c")
+        .expect("failed to find taglib_c via pkg-config");
+
+    // Rebuild if zig sources change
+    println!("cargo:rerun-if-changed={}", zig_core_dir.join("src").display());
+}
diff --git a/crates/mt-core/src/ffi.rs b/crates/mt-core/src/ffi.rs
new file mode 100644
index 0000000..c51677c
--- /dev/null
+++ b/crates/mt-core/src/ffi.rs
@@ -0,0 +1,1425 @@
+//! FFI bindings for Zig mtcore library
+//!
+//! This module provides Rust bindings to call Zig functions exported from libmtcore.a.
+//! All types use #[repr(C)] to match Zig's extern struct layout.
+
+use std::os::raw::c_char;
+
+// ============================================================================
+// Type Definitions (matching zig-core/src/types.zig)
+// ============================================================================
+
+/// File fingerprint for change detection
+#[repr(C)]
+#[derive(Debug, Clone, Copy)]
+pub struct FileFingerprint {
+    /// Modification time in nanoseconds since Unix epoch (0 if unavailable)
+    pub mtime_ns: i64,
+    /// File size in bytes
+    pub size: i64,
+    /// Inode number (0 if unavailable, Unix only)
+    pub inode: u64,
+    /// Whether mtime_ns is valid
+    pub has_mtime: bool,
+    /// Whether inode is valid
+    pub has_inode: bool,
+}
+
+impl FileFingerprint {
+    /// Check if two fingerprints match (ignores inode)
+    pub fn matches(&self, other: &FileFingerprint) -> bool {
+        if self.has_mtime != other.has_mtime {
+            return false;
+        }
+        if self.has_mtime && self.mtime_ns != other.mtime_ns {
+            return false;
+        }
+        self.size == other.size
+    }
+}
+
+/// Extracted metadata from an audio file
+/// Uses fixed-size buffers for FFI safety - no allocations cross the boundary
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct ExtractedMetadata {
+    // File info
+    pub filepath: [u8; 4096],
+    pub filepath_len: u32,
+    pub file_size: i64,
+    pub file_mtime_ns: i64,
+    pub file_inode: u64,
+    pub has_mtime: bool,
+    pub has_inode: bool,
+
+    // Basic tags
+    pub title: [u8; 512],
+    pub title_len: u32,
+    pub artist: [u8; 512],
+    pub artist_len: u32,
+    pub album: [u8; 512],
+    pub album_len: u32,
+    pub album_artist: [u8; 512],
+    pub album_artist_len: u32,
+
+    // Track info
+    pub track_number: [u8; 32],
+    pub track_number_len: u32,
+    pub track_total: [u8; 32],
+    pub track_total_len: u32,
+    pub disc_number: u32,
+    pub disc_total: u32,
+    pub has_disc_number: bool,
+    pub has_disc_total: bool,
+
+    // Date/genre
+    pub date: [u8; 64],
+    pub date_len: u32,
+    pub genre: [u8; 256],
+    pub genre_len: u32,
+
+    // Audio properties
+    pub duration_secs: f64,
+    pub bitrate: u32,
+    pub sample_rate: u32,
+    pub channels: u8,
+    pub has_duration: bool,
+    pub has_bitrate: bool,
+    pub has_sample_rate: bool,
+    pub has_channels: bool,
+
+    // Status
+    pub is_valid: bool,
+    pub error_code: u32,
+}
+
+impl ExtractedMetadata {
+    /// Get title as a string slice
+    pub fn get_title(&self) -> &str {
+        std::str::from_utf8(&self.title[..self.title_len as usize]).unwrap_or("")
+    }
+
+    /// Get artist as a string slice
+    pub fn get_artist(&self) -> &str {
+        std::str::from_utf8(&self.artist[..self.artist_len as usize]).unwrap_or("")
+    }
+
+    /// Get album as a string slice
+    pub fn get_album(&self) -> &str {
+        std::str::from_utf8(&self.album[..self.album_len as usize]).unwrap_or("")
+    }
+
+    /// Get filepath as a string slice
+    pub fn get_filepath(&self) -> &str {
+        std::str::from_utf8(&self.filepath[..self.filepath_len as usize]).unwrap_or("")
+    }
+}
+
+/// Scan statistics
+#[repr(C)]
+#[derive(Debug, Clone, Copy, Default)]
+pub struct ScanStats {
+    pub visited: u64,
+    pub added: u64,
+    pub modified: u64,
+    pub unchanged: u64,
+    pub deleted: u64,
+    pub errors: u64,
+}
+
+// ============================================================================
+// Artwork Cache Types (matching zig-core/src/scanner/artwork_cache.zig)
+// ============================================================================
+
+/// Artwork data from audio file or folder.
+/// Uses fixed-size buffers for FFI safety - no allocations cross the boundary.
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct FfiArtwork {
+    /// Base64-encoded image data (fixed-size buffer)
+    pub data: [u8; 8192],
+    pub data_len: u32,
+    /// MIME type (e.g., "image/jpeg", "image/png")
+    pub mime_type: [u8; 64],
+    pub mime_type_len: u32,
+    /// Source: "embedded" or "folder"
+    pub source: [u8; 16],
+    pub source_len: u32,
+    /// Filename for folder-based artwork
+    pub filename: [u8; 256],
+    pub filename_len: u32,
+    pub has_filename: bool,
+}
+
+impl FfiArtwork {
+    /// Get the data as a byte slice
+    pub fn get_data(&self) -> &[u8] {
+        &self.data[..self.data_len as usize]
+    }
+
+    /// Get the MIME type as a string slice
+    pub fn get_mime_type(&self) -> &str {
+        std::str::from_utf8(&self.mime_type[..self.mime_type_len as usize]).unwrap_or("")
+    }
+
+    /// Get the source as a string slice
+    pub fn get_source(&self) -> &str {
+        std::str::from_utf8(&self.source[..self.source_len as usize]).unwrap_or("")
+    }
+
+    /// Get the filename if present
+    pub fn get_filename(&self) -> Option<&str> {
+        if self.has_filename {
+            std::str::from_utf8(&self.filename[..self.filename_len as usize]).ok()
+        } else {
+            None
+        }
+    }
+}
+
+/// Opaque handle to Zig artwork cache
+pub type ArtworkCacheHandle = *mut std::ffi::c_void;
+
+// ============================================================================
+// FFI Function Declarations (from zig-core/src/ffi.zig)
+// ============================================================================
+
+unsafe extern "C" {
+    /// Extract metadata from a single file.
+    /// Returns a pointer to ExtractedMetadata that must be freed with mt_free_metadata.
+    pub fn mt_extract_metadata(path: *const c_char) -> *mut ExtractedMetadata;
+
+    /// Free metadata returned by mt_extract_metadata
+    pub fn mt_free_metadata(ptr: *mut ExtractedMetadata);
+
+    /// Extract metadata into a caller-provided buffer (no allocation).
+    /// Returns true on success.
+    pub fn mt_extract_metadata_into(path: *const c_char, out: *mut ExtractedMetadata) -> bool;
+
+    /// Batch extract metadata from multiple files.
+    /// Caller provides arrays for paths and results.
+    /// Returns number of successfully extracted files.
+    pub fn mt_extract_metadata_batch(
+        paths: *const *const c_char,
+        count: usize,
+        results: *mut ExtractedMetadata,
+    ) -> usize;
+
+    /// Check if a file has a supported audio extension
+    pub fn mt_is_audio_file(path: *const c_char) -> bool;
+
+    /// Get file fingerprint from path.
+    /// Returns true on success, populates out_fp.
+    pub fn mt_get_fingerprint(path: *const c_char, out_fp: *mut FileFingerprint) -> bool;
+
+    /// Compare two fingerprints for equality (ignores inode)
+    pub fn mt_fingerprint_matches(fp1: *const FileFingerprint, fp2: *const FileFingerprint)
+        -> bool;
+
+    /// Get library version string
+    pub fn mt_version() -> *const c_char;
+
+    // ========================================================================
+    // Artwork Cache FFI
+    // ========================================================================
+
+    /// Create new artwork cache with default capacity (100 entries).
+    /// Returns opaque handle or null on allocation failure.
+    pub fn mt_artwork_cache_new() -> ArtworkCacheHandle;
+
+    /// Create artwork cache with custom capacity.
+    /// Returns opaque handle or null on allocation failure.
+    pub fn mt_artwork_cache_new_with_capacity(capacity: usize) -> ArtworkCacheHandle;
+
+    /// Get artwork for track, loading from file if not cached.
+    /// Returns true if artwork was found, false otherwise.
+    /// The out parameter is populated only when returning true.
+    pub fn mt_artwork_cache_get_or_load(
+        cache: ArtworkCacheHandle,
+        track_id: i64,
+        filepath: *const c_char,
+        out: *mut FfiArtwork,
+    ) -> bool;
+
+    /// Invalidate cache entry for a specific track.
+    /// Call this when track metadata is updated.
+    pub fn mt_artwork_cache_invalidate(cache: ArtworkCacheHandle, track_id: i64);
+
+    /// Clear all cache entries.
+    pub fn mt_artwork_cache_clear(cache: ArtworkCacheHandle);
+
+    /// Get current number of cached items.
+    pub fn mt_artwork_cache_len(cache: ArtworkCacheHandle) -> usize;
+
+    /// Free artwork cache and all associated resources.
+    pub fn mt_artwork_cache_free(cache: ArtworkCacheHandle);
+}
+
+// ============================================================================
+// Inventory Scanner FFI
+// ============================================================================
+
+/// Opaque handle to Zig inventory scanner
+pub type InventoryScannerHandle = *mut std::ffi::c_void;
+
+/// Progress callback type for inventory scanning
+pub type InventoryProgressCallback = Option<extern "C" fn(visited: usize)>;
+
+unsafe extern "C" {
+    /// Create a new inventory scanner.
+    /// Returns opaque handle or null on allocation failure.
+    pub fn mt_inventory_scanner_new() -> InventoryScannerHandle;
+
+    /// Set recursive mode for directory scanning.
+    pub fn mt_inventory_scanner_set_recursive(handle: InventoryScannerHandle, recursive: bool);
+
+    /// Add a path to scan.
+    /// Returns true on success, false on allocation failure.
+    pub fn mt_inventory_scanner_add_path(
+        handle: InventoryScannerHandle,
+        path: *const c_char,
+    ) -> bool;
+
+    /// Add a database fingerprint for comparison.
+    /// Returns true on success, false on allocation failure.
+    pub fn mt_inventory_scanner_add_db_fingerprint(
+        handle: InventoryScannerHandle,
+        path: *const c_char,
+        fp: *const FileFingerprint,
+    ) -> bool;
+
+    /// Run the inventory scan.
+    /// Returns true on success, false on error.
+    pub fn mt_inventory_scanner_run(
+        handle: InventoryScannerHandle,
+        progress_callback: InventoryProgressCallback,
+    ) -> bool;
+
+    /// Get the count of added files.
+    pub fn mt_inventory_scanner_get_added_count(handle: InventoryScannerHandle) -> usize;
+
+    /// Get the count of modified files.
+    pub fn mt_inventory_scanner_get_modified_count(handle: InventoryScannerHandle) -> usize;
+
+    /// Get the count of unchanged files.
+    pub fn mt_inventory_scanner_get_unchanged_count(handle: InventoryScannerHandle) -> usize;
+
+    /// Get the count of deleted files.
+    pub fn mt_inventory_scanner_get_deleted_count(handle: InventoryScannerHandle) -> usize;
+
+    /// Get an added file entry by index.
+    /// Returns true if index is valid and data was written.
+    pub fn mt_inventory_scanner_get_added(
+        handle: InventoryScannerHandle,
+        index: usize,
+        out_path: *mut [u8; 4096],
+        out_path_len: *mut u32,
+        out_fp: *mut FileFingerprint,
+    ) -> bool;
+
+    /// Get a modified file entry by index.
+    /// Returns true if index is valid and data was written.
+    pub fn mt_inventory_scanner_get_modified(
+        handle: InventoryScannerHandle,
+        index: usize,
+        out_path: *mut [u8; 4096],
+        out_path_len: *mut u32,
+        out_fp: *mut FileFingerprint,
+    ) -> bool;
+
+    /// Get an unchanged file path by index.
+    /// Returns true if index is valid and data was written.
+    pub fn mt_inventory_scanner_get_unchanged(
+        handle: InventoryScannerHandle,
+        index: usize,
+        out_path: *mut [u8; 4096],
+        out_path_len: *mut u32,
+    ) -> bool;
+
+    /// Get a deleted file path by index.
+    /// Returns true if index is valid and data was written.
+    pub fn mt_inventory_scanner_get_deleted(
+        handle: InventoryScannerHandle,
+        index: usize,
+        out_path: *mut [u8; 4096],
+        out_path_len: *mut u32,
+    ) -> bool;
+
+    /// Get scan statistics.
+    pub fn mt_inventory_scanner_get_stats(handle: InventoryScannerHandle, out_stats: *mut ScanStats);
+
+    /// Free the inventory scanner and all associated resources.
+    pub fn mt_inventory_scanner_free(handle: InventoryScannerHandle);
+}
+
+// ============================================================================
+// Tests
+// ============================================================================
+
+// ============================================================================
+// Database Model Types (matching zig-core/src/db/models.zig)
+// ============================================================================
+
+/// Track model - represents a music file in the library
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct Track {
+    pub id: i64,
+    pub filepath: [u8; 4096],
+    pub filepath_len: u32,
+    pub title: [u8; 512],
+    pub title_len: u32,
+    pub artist: [u8; 512],
+    pub artist_len: u32,
+    pub album: [u8; 512],
+    pub album_len: u32,
+    pub album_artist: [u8; 512],
+    pub album_artist_len: u32,
+    pub track_number: [u8; 32],
+    pub track_number_len: u32,
+    pub track_total: [u8; 32],
+    pub track_total_len: u32,
+    pub date: [u8; 32],
+    pub date_len: u32,
+    pub genre: [u8; 256],
+    pub genre_len: u32,
+    pub duration_secs: f64,
+    pub file_size: i64,
+    pub file_mtime_ns: i64,
+    pub file_inode: i64,
+    pub content_hash: [u8; 64],
+    pub content_hash_len: u32,
+    pub added_date: i64,
+    pub last_played: i64,
+    pub play_count: u32,
+    pub lastfm_loved: bool,
+    pub missing: bool,
+    pub last_seen_at: i64,
+}
+
+impl Track {
+    pub fn get_filepath(&self) -> &str {
+        std::str::from_utf8(&self.filepath[..self.filepath_len as usize]).unwrap_or("")
+    }
+
+    pub fn get_title(&self) -> &str {
+        std::str::from_utf8(&self.title[..self.title_len as usize]).unwrap_or("")
+    }
+
+    pub fn get_artist(&self) -> &str {
+        std::str::from_utf8(&self.artist[..self.artist_len as usize]).unwrap_or("")
+    }
+
+    pub fn get_album(&self) -> &str {
+        std::str::from_utf8(&self.album[..self.album_len as usize]).unwrap_or("")
+    }
+}
+
+/// Playlist model
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct Playlist {
+    pub id: i64,
+    pub name: [u8; 512],
+    pub name_len: u32,
+    pub position: u32,
+    pub created_at: i64,
+}
+
+impl Playlist {
+    pub fn get_name(&self) -> &str {
+        std::str::from_utf8(&self.name[..self.name_len as usize]).unwrap_or("")
+    }
+}
+
+/// Queue item model
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct QueueItem {
+    pub id: i64,
+    pub filepath: [u8; 4096],
+    pub filepath_len: u32,
+}
+
+impl QueueItem {
+    pub fn get_filepath(&self) -> &str {
+        std::str::from_utf8(&self.filepath[..self.filepath_len as usize]).unwrap_or("")
+    }
+}
+
+/// Search parameters
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct SearchParams {
+    pub query: [u8; 512],
+    pub query_len: u32,
+    pub limit: u32,
+    pub offset: u32,
+    pub sort_by: u8,
+    pub sort_order: u8,
+}
+
+impl SearchParams {
+    pub fn get_query(&self) -> &str {
+        std::str::from_utf8(&self.query[..self.query_len as usize]).unwrap_or("")
+    }
+}
+
+/// Queue snapshot
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct QueueSnapshot {
+    pub current_position: u32,
+    pub total_items: u32,
+    pub shuffle_enabled: bool,
+    pub repeat_mode: u8,
+    pub current_track_id: i64,
+}
+
+/// Playlist info
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct PlaylistInfo {
+    pub id: i64,
+    pub name: [u8; 256],
+    pub name_len: u32,
+    pub track_count: u32,
+    pub total_duration: i64,
+    pub created_at: i64,
+    pub updated_at: i64,
+}
+
+impl PlaylistInfo {
+    pub fn get_name(&self) -> &str {
+        std::str::from_utf8(&self.name[..self.name_len as usize]).unwrap_or("")
+    }
+}
+
+/// Setting entry
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct SettingEntry {
+    pub key: [u8; 128],
+    pub key_len: u32,
+    pub value: [u8; 4096],
+    pub value_len: u32,
+}
+
+impl SettingEntry {
+    pub fn get_key(&self) -> &str {
+        std::str::from_utf8(&self.key[..self.key_len as usize]).unwrap_or("")
+    }
+
+    pub fn get_value(&self) -> &str {
+        std::str::from_utf8(&self.value[..self.value_len as usize]).unwrap_or("")
+    }
+}
+
+/// Scrobble record
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct ScrobbleRecord {
+    pub id: i64,
+    pub track_id: i64,
+    pub artist: [u8; 512],
+    pub artist_len: u32,
+    pub track: [u8; 512],
+    pub track_len: u32,
+    pub album: [u8; 512],
+    pub album_len: u32,
+    pub timestamp: i64,
+    pub duration: i32,
+    pub submitted: bool,
+}
+
+impl ScrobbleRecord {
+    pub fn get_artist(&self) -> &str {
+        std::str::from_utf8(&self.artist[..self.artist_len as usize]).unwrap_or("")
+    }
+
+    pub fn get_track(&self) -> &str {
+        std::str::from_utf8(&self.track[..self.track_len as usize]).unwrap_or("")
+    }
+
+    pub fn get_album(&self) -> &str {
+        std::str::from_utf8(&self.album[..self.album_len as usize]).unwrap_or("")
+    }
+}
+
+/// Watched folder
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct WatchedFolderFFI {
+    pub id: i64,
+    pub path: [u8; 4096],
+    pub path_len: u32,
+    pub scan_mode: u8,
+    pub enabled: bool,
+    pub last_scan: i64,
+    pub track_count: u32,
+}
+
+impl WatchedFolderFFI {
+    pub fn get_path(&self) -> &str {
+        std::str::from_utf8(&self.path[..self.path_len as usize]).unwrap_or("")
+    }
+}
+
+// ============================================================================
+// Last.fm FFI Type Definitions
+// ============================================================================
+
+/// Last.fm scrobble request (for track.scrobble API call)
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct LastfmScrobbleRequest {
+    pub artist: [u8; 512],
+    pub artist_len: u32,
+    pub track: [u8; 512],
+    pub track_len: u32,
+    pub album: [u8; 512],
+    pub album_len: u32,
+    pub timestamp: i64,
+    pub duration: i32,
+    pub track_number: u32,
+}
+
+impl LastfmScrobbleRequest {
+    pub fn get_artist(&self) -> &str {
+        std::str::from_utf8(&self.artist[..self.artist_len as usize]).unwrap_or("")
+    }
+
+    pub fn get_track(&self) -> &str {
+        std::str::from_utf8(&self.track[..self.track_len as usize]).unwrap_or("")
+    }
+
+    pub fn get_album(&self) -> &str {
+        std::str::from_utf8(&self.album[..self.album_len as usize]).unwrap_or("")
+    }
+}
+
+/// Last.fm now playing request (for track.updateNowPlaying API call)
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct LastfmNowPlayingRequest {
+    pub artist: [u8; 512],
+    pub artist_len: u32,
+    pub track: [u8; 512],
+    pub track_len: u32,
+    pub album: [u8; 512],
+    pub album_len: u32,
+    pub duration: i32,
+    pub track_number: u32,
+}
+
+impl LastfmNowPlayingRequest {
+    pub fn get_artist(&self) -> &str {
+        std::str::from_utf8(&self.artist[..self.artist_len as usize]).unwrap_or("")
+    }
+
+    pub fn get_track(&self) -> &str {
+        std::str::from_utf8(&self.track[..self.track_len as usize]).unwrap_or("")
+    }
+
+    pub fn get_album(&self) -> &str {
+        std::str::from_utf8(&self.album[..self.album_len as usize]).unwrap_or("")
+    }
+}
+
+/// Last.fm built request (ready for HTTP execution)
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct LastfmBuiltRequest {
+    pub body: [u8; 8192],
+    pub body_len: u32,
+    pub method: [u8; 16],
+    pub method_len: u32,
+    pub api_method: [u8; 64],
+    pub api_method_len: u32,
+}
+
+impl LastfmBuiltRequest {
+    pub fn get_body(&self) -> &str {
+        std::str::from_utf8(&self.body[..self.body_len as usize]).unwrap_or("")
+    }
+
+    pub fn get_method(&self) -> &str {
+        std::str::from_utf8(&self.method[..self.method_len as usize]).unwrap_or("")
+    }
+
+    pub fn get_api_method(&self) -> &str {
+        std::str::from_utf8(&self.api_method[..self.api_method_len as usize]).unwrap_or("")
+    }
+}
+
+/// Last.fm API response
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct LastfmApiResponse {
+    pub success: bool,
+    pub error_code: u32,
+    pub error_message: [u8; 512],
+    pub error_message_len: u32,
+}
+
+impl LastfmApiResponse {
+    pub fn get_error_message(&self) -> &str {
+        std::str::from_utf8(&self.error_message[..self.error_message_len as usize]).unwrap_or("")
+    }
+}
+
+/// Opaque handle to Last.fm client (managed by Zig)
+#[repr(C)]
+pub struct LastfmClient {
+    _private: [u8; 0],
+}
+
+// ============================================================================
+// Database FFI Function Declarations
+// ============================================================================
+
+unsafe extern "C" {
+    // Track functions
+    pub fn mt_track_new() -> Track;
+    pub fn mt_track_set_filepath(track: *mut Track, path: *const c_char);
+    pub fn mt_track_set_title(track: *mut Track, title: *const c_char);
+    pub fn mt_track_set_artist(track: *mut Track, artist: *const c_char);
+    pub fn mt_track_set_album(track: *mut Track, album: *const c_char);
+    pub fn mt_track_validate(track: *const Track) -> bool;
+    pub fn mt_track_normalize(track: *mut Track);
+
+    // Search params functions
+    pub fn mt_search_params_new() -> SearchParams;
+    pub fn mt_search_params_set_query(params: *mut SearchParams, query: *const c_char);
+    pub fn mt_search_params_set_limit(params: *mut SearchParams, limit: u32);
+    pub fn mt_search_params_set_offset(params: *mut SearchParams, offset: u32);
+    pub fn mt_search_params_set_sort_by(params: *mut SearchParams, sort_by: u8);
+    pub fn mt_search_params_set_sort_order(params: *mut SearchParams, sort_order: u8);
+
+    // Queue manager functions
+    pub fn mt_queue_calculate_move(
+        from_pos: u32,
+        to_pos: u32,
+        total_items: u32,
+        out_shift_start: *mut u32,
+        out_shift_end: *mut u32,
+        out_shift_direction: *mut u8,
+    ) -> bool;
+    pub fn mt_queue_build_shuffle_order(
+        count: u32,
+        current_position: u32,
+        random_seed: u64,
+        out_order: *mut *mut u32,
+        out_len: *mut u32,
+    ) -> bool;
+    pub fn mt_queue_free_shuffle_order(order: *mut u32, len: u32);
+
+    // Playlist functions
+    pub fn mt_playlist_new() -> Playlist;
+    pub fn mt_playlist_set_name(playlist: *mut Playlist, name: *const c_char);
+    pub fn mt_playlist_info_new() -> PlaylistInfo;
+    pub fn mt_playlist_info_set_name(info: *mut PlaylistInfo, name: *const c_char);
+
+    // Settings functions
+    pub fn mt_setting_new() -> SettingEntry;
+    pub fn mt_setting_set_key(entry: *mut SettingEntry, key: *const c_char);
+    pub fn mt_setting_set_value(entry: *mut SettingEntry, value: *const c_char);
+    pub fn mt_setting_parse_bool(value: *const c_char, out_value: *mut bool) -> bool;
+    pub fn mt_setting_parse_i32(value: *const c_char, out_value: *mut i32) -> bool;
+    pub fn mt_setting_parse_f32(value: *const c_char, out_value: *mut f32) -> bool;
+
+    // Scrobble functions
+    pub fn mt_scrobble_new() -> ScrobbleRecord;
+    pub fn mt_scrobble_set_artist(record: *mut ScrobbleRecord, artist: *const c_char);
+    pub fn mt_scrobble_set_track(record: *mut ScrobbleRecord, track: *const c_char);
+    pub fn mt_scrobble_set_album(record: *mut ScrobbleRecord, album: *const c_char);
+    pub fn mt_scrobble_is_eligible(played_duration: i32, track_duration: i32) -> bool;
+
+    // Watched folder functions
+    pub fn mt_watched_folder_new() -> WatchedFolderFFI;
+    pub fn mt_watched_folder_set_path(folder: *mut WatchedFolderFFI, path: *const c_char);
+    pub fn mt_watched_folder_set_scan_mode(folder: *mut WatchedFolderFFI, mode: u8);
+
+    // Queue item functions
+    pub fn mt_queue_item_new() -> QueueItem;
+    pub fn mt_queue_item_set_filepath(item: *mut QueueItem, path: *const c_char);
+    pub fn mt_queue_snapshot_new() -> QueueSnapshot;
+
+    // ========================================================================
+    // Last.fm FFI Functions
+    // ========================================================================
+
+    // Scrobble request functions
+    pub fn mt_lastfm_scrobble_request_new() -> LastfmScrobbleRequest;
+    pub fn mt_lastfm_scrobble_set_artist(req: *mut LastfmScrobbleRequest, artist: *const c_char);
+    pub fn mt_lastfm_scrobble_set_track(req: *mut LastfmScrobbleRequest, track: *const c_char);
+    pub fn mt_lastfm_scrobble_set_album(req: *mut LastfmScrobbleRequest, album: *const c_char);
+    pub fn mt_lastfm_scrobble_set_timestamp(req: *mut LastfmScrobbleRequest, timestamp: i64);
+    pub fn mt_lastfm_scrobble_set_duration(req: *mut LastfmScrobbleRequest, duration: i32);
+    pub fn mt_lastfm_scrobble_set_track_number(req: *mut LastfmScrobbleRequest, track_number: u32);
+
+    // Now playing request functions
+    pub fn mt_lastfm_now_playing_request_new() -> LastfmNowPlayingRequest;
+    pub fn mt_lastfm_now_playing_set_artist(req: *mut LastfmNowPlayingRequest, artist: *const c_char);
+    pub fn mt_lastfm_now_playing_set_track(req: *mut LastfmNowPlayingRequest, track: *const c_char);
+    pub fn mt_lastfm_now_playing_set_album(req: *mut LastfmNowPlayingRequest, album: *const c_char);
+    pub fn mt_lastfm_now_playing_set_duration(req: *mut LastfmNowPlayingRequest, duration: i32);
+    pub fn mt_lastfm_now_playing_set_track_number(req: *mut LastfmNowPlayingRequest, track_number: u32);
+
+    // Client lifecycle functions
+    pub fn mt_lastfm_client_new(api_key: *const c_char, api_secret: *const c_char) -> *mut LastfmClient;
+    pub fn mt_lastfm_client_free(client: *mut LastfmClient);
+    pub fn mt_lastfm_client_set_session_key(client: *mut LastfmClient, session_key: *const c_char);
+    pub fn mt_lastfm_client_clear_session_key(client: *mut LastfmClient);
+    pub fn mt_lastfm_client_is_authenticated(client: *const LastfmClient) -> bool;
+
+    // Client request building functions
+    pub fn mt_lastfm_client_build_scrobble(
+        client: *mut LastfmClient,
+        scrobble: *const LastfmScrobbleRequest,
+        out_request: *mut LastfmBuiltRequest,
+    ) -> bool;
+    pub fn mt_lastfm_client_build_now_playing(
+        client: *mut LastfmClient,
+        now_playing: *const LastfmNowPlayingRequest,
+        out_request: *mut LastfmBuiltRequest,
+    ) -> bool;
+
+    // Client rate limiting functions
+    pub fn mt_lastfm_client_wait_for_rate_limit(client: *mut LastfmClient);
+    pub fn mt_lastfm_client_get_wait_time_ns(client: *mut LastfmClient) -> u64;
+    pub fn mt_lastfm_client_record_request(client: *mut LastfmClient);
+
+    // Signature generation
+    pub fn mt_lastfm_generate_signature(
+        pairs: *const *const c_char,
+        count: u32,
+        api_secret: *const c_char,
+        out_sig: *mut u8,
+    ) -> bool;
+
+    // Response helpers
+    pub fn mt_lastfm_response_success() -> LastfmApiResponse;
+    pub fn mt_lastfm_response_error(error_code: u32, message: *const c_char) -> LastfmApiResponse;
+    pub fn mt_lastfm_built_request_new() -> LastfmBuiltRequest;
+    pub fn mt_lastfm_get_api_url() -> *const c_char;
+}
+
+// ============================================================================
+// Tests
+// ============================================================================
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::ffi::{CStr, CString};
+
+    #[test]
+    fn test_version() {
+        unsafe {
+            let version_ptr = mt_version();
+            let version = CStr::from_ptr(version_ptr).to_str().unwrap();
+            assert_eq!(version, "0.1.0");
+        }
+    }
+
+    #[test]
+    fn test_is_audio_file() {
+        unsafe {
+            // Test supported extensions
+            let mp3 = CString::new("song.mp3").unwrap();
+            assert!(mt_is_audio_file(mp3.as_ptr()));
+
+            let flac = CString::new("track.flac").unwrap();
+            assert!(mt_is_audio_file(flac.as_ptr()));
+
+            let m4a = CString::new("audio.m4a").unwrap();
+            assert!(mt_is_audio_file(m4a.as_ptr()));
+
+            // Test case insensitivity
+            let mp3_upper = CString::new("SONG.MP3").unwrap();
+            assert!(mt_is_audio_file(mp3_upper.as_ptr()));
+
+            // Test unsupported extensions
+            let jpg = CString::new("image.jpg").unwrap();
+            assert!(!mt_is_audio_file(jpg.as_ptr()));
+
+            let txt = CString::new("readme.txt").unwrap();
+            assert!(!mt_is_audio_file(txt.as_ptr()));
+        }
+    }
+
+    #[test]
+    fn test_fingerprint_matches() {
+        let fp1 = FileFingerprint {
+            mtime_ns: 1234567890,
+            size: 1000,
+            inode: 12345,
+            has_mtime: true,
+            has_inode: true,
+        };
+
+        let fp2 = FileFingerprint {
+            mtime_ns: 1234567890,
+            size: 1000,
+            inode: 99999, // Different inode - should still match
+            has_mtime: true,
+            has_inode: true,
+        };
+
+        let fp3 = FileFingerprint {
+            mtime_ns: 1234567890,
+            size: 2000, // Different size
+            inode: 12345,
+            has_mtime: true,
+            has_inode: true,
+        };
+
+        assert!(fp1.matches(&fp2));
+        assert!(!fp1.matches(&fp3));
+
+        // Test FFI function
+        unsafe {
+            assert!(mt_fingerprint_matches(&fp1, &fp2));
+            assert!(!mt_fingerprint_matches(&fp1, &fp3));
+        }
+    }
+
+    #[test]
+    fn test_extract_metadata_into_nonexistent() {
+        unsafe {
+            let path = CString::new("/nonexistent/path.mp3").unwrap();
+            let mut metadata = std::mem::zeroed::<ExtractedMetadata>();
+
+            let success = mt_extract_metadata_into(path.as_ptr(), &mut metadata);
+
+            // Should fail for nonexistent file
+            assert!(!success);
+            assert!(!metadata.is_valid);
+        }
+    }
+
+    #[test]
+    fn test_inventory_scanner_creation() {
+        unsafe {
+            let handle = mt_inventory_scanner_new();
+            assert!(!handle.is_null());
+            mt_inventory_scanner_free(handle);
+        }
+    }
+
+    #[test]
+    fn test_inventory_scanner_add_path() {
+        unsafe {
+            let handle = mt_inventory_scanner_new();
+            assert!(!handle.is_null());
+
+            let path = CString::new("/test/path").unwrap();
+            let success = mt_inventory_scanner_add_path(handle, path.as_ptr());
+            assert!(success);
+
+            mt_inventory_scanner_free(handle);
+        }
+    }
+
+    #[test]
+    fn test_inventory_scanner_add_db_fingerprint() {
+        unsafe {
+            let handle = mt_inventory_scanner_new();
+            assert!(!handle.is_null());
+
+            let path = CString::new("/test/song.mp3").unwrap();
+            let fp = FileFingerprint {
+                mtime_ns: 1234567890,
+                size: 1000,
+                inode: 0,
+                has_mtime: true,
+                has_inode: false,
+            };
+            let success = mt_inventory_scanner_add_db_fingerprint(handle, path.as_ptr(), &fp);
+            assert!(success);
+
+            mt_inventory_scanner_free(handle);
+        }
+    }
+
+    #[test]
+    fn test_inventory_scanner_empty_scan() {
+        unsafe {
+            let handle = mt_inventory_scanner_new();
+            assert!(!handle.is_null());
+
+            // Add a nonexistent path
+            let path = CString::new("/nonexistent/path/that/does/not/exist").unwrap();
+            mt_inventory_scanner_add_path(handle, path.as_ptr());
+
+            // Run scan
+            let success = mt_inventory_scanner_run(handle, None);
+            assert!(success);
+
+            // Should have no results for nonexistent path
+            assert_eq!(mt_inventory_scanner_get_added_count(handle), 0);
+            assert_eq!(mt_inventory_scanner_get_modified_count(handle), 0);
+            assert_eq!(mt_inventory_scanner_get_unchanged_count(handle), 0);
+            assert_eq!(mt_inventory_scanner_get_deleted_count(handle), 0);
+
+            mt_inventory_scanner_free(handle);
+        }
+    }
+
+    // ========================================================================
+    // Database FFI Tests
+    // ========================================================================
+
+    #[test]
+    fn test_track_creation() {
+        unsafe {
+            let mut track = mt_track_new();
+            assert_eq!(track.id, 0);
+
+            let path = CString::new("/music/test.mp3").unwrap();
+            mt_track_set_filepath(&mut track, path.as_ptr());
+            assert_eq!(track.get_filepath(), "/music/test.mp3");
+
+            let title = CString::new("Test Song").unwrap();
+            mt_track_set_title(&mut track, title.as_ptr());
+            assert_eq!(track.get_title(), "Test Song");
+
+            let artist = CString::new("Test Artist").unwrap();
+            mt_track_set_artist(&mut track, artist.as_ptr());
+            assert_eq!(track.get_artist(), "Test Artist");
+
+            let album = CString::new("Test Album").unwrap();
+            mt_track_set_album(&mut track, album.as_ptr());
+            assert_eq!(track.get_album(), "Test Album");
+
+            // Should validate successfully
+            assert!(mt_track_validate(&track));
+        }
+    }
+
+    #[test]
+    fn test_track_validation_fails() {
+        unsafe {
+            let track = mt_track_new();
+            // Empty track should not validate
+            assert!(!mt_track_validate(&track));
+        }
+    }
+
+    #[test]
+    fn test_search_params() {
+        unsafe {
+            let mut params = mt_search_params_new();
+            assert_eq!(params.limit, 100); // Default limit
+
+            let query = CString::new("beatles").unwrap();
+            mt_search_params_set_query(&mut params, query.as_ptr());
+            assert_eq!(params.get_query(), "beatles");
+
+            mt_search_params_set_limit(&mut params, 50);
+            assert_eq!(params.limit, 50);
+
+            mt_search_params_set_offset(&mut params, 10);
+            assert_eq!(params.offset, 10);
+
+            mt_search_params_set_sort_by(&mut params, 1); // artist
+            assert_eq!(params.sort_by, 1);
+
+            mt_search_params_set_sort_order(&mut params, 1); // descending
+            assert_eq!(params.sort_order, 1);
+        }
+    }
+
+    #[test]
+    fn test_queue_calculate_move() {
+        unsafe {
+            let mut shift_start: u32 = 0;
+            let mut shift_end: u32 = 0;
+            let mut shift_direction: u8 = 0;
+
+            let success = mt_queue_calculate_move(
+                2,
+                5,
+                10,
+                &mut shift_start,
+                &mut shift_end,
+                &mut shift_direction,
+            );
+
+            assert!(success);
+            assert_eq!(shift_start, 2);
+            assert_eq!(shift_end, 5);
+            assert_eq!(shift_direction, 2); // down
+        }
+    }
+
+    #[test]
+    fn test_queue_calculate_move_invalid() {
+        unsafe {
+            let mut shift_start: u32 = 0;
+            let mut shift_end: u32 = 0;
+            let mut shift_direction: u8 = 0;
+
+            // Invalid position (15 >= 10)
+            let success = mt_queue_calculate_move(
+                15,
+                3,
+                10,
+                &mut shift_start,
+                &mut shift_end,
+                &mut shift_direction,
+            );
+
+            assert!(!success);
+        }
+    }
+
+    #[test]
+    fn test_playlist_creation() {
+        unsafe {
+            let mut playlist = mt_playlist_new();
+            assert_eq!(playlist.id, 0);
+
+            let name = CString::new("My Playlist").unwrap();
+            mt_playlist_set_name(&mut playlist, name.as_ptr());
+            assert_eq!(playlist.get_name(), "My Playlist");
+        }
+    }
+
+    #[test]
+    fn test_playlist_info_creation() {
+        unsafe {
+            let mut info = mt_playlist_info_new();
+            assert_eq!(info.id, 0);
+            assert_eq!(info.track_count, 0);
+
+            let name = CString::new("Info Playlist").unwrap();
+            mt_playlist_info_set_name(&mut info, name.as_ptr());
+            assert_eq!(info.get_name(), "Info Playlist");
+        }
+    }
+
+    #[test]
+    fn test_setting_entry() {
+        unsafe {
+            let mut entry = mt_setting_new();
+            assert_eq!(entry.key_len, 0);
+            assert_eq!(entry.value_len, 0);
+
+            let key = CString::new("volume").unwrap();
+            mt_setting_set_key(&mut entry, key.as_ptr());
+            assert_eq!(entry.get_key(), "volume");
+
+            let value = CString::new("75").unwrap();
+            mt_setting_set_value(&mut entry, value.as_ptr());
+            assert_eq!(entry.get_value(), "75");
+        }
+    }
+
+    #[test]
+    fn test_setting_parse_bool() {
+        unsafe {
+            let mut out_val: bool = false;
+
+            let true_str = CString::new("true").unwrap();
+            assert!(mt_setting_parse_bool(true_str.as_ptr(), &mut out_val));
+            assert!(out_val);
+
+            let false_str = CString::new("false").unwrap();
+            assert!(mt_setting_parse_bool(false_str.as_ptr(), &mut out_val));
+            assert!(!out_val);
+
+            let invalid = CString::new("invalid").unwrap();
+            assert!(!mt_setting_parse_bool(invalid.as_ptr(), &mut out_val));
+        }
+    }
+
+    #[test]
+    fn test_setting_parse_i32() {
+        unsafe {
+            let mut out_val: i32 = 0;
+
+            let val = CString::new("42").unwrap();
+            assert!(mt_setting_parse_i32(val.as_ptr(), &mut out_val));
+            assert_eq!(out_val, 42);
+
+            let neg = CString::new("-10").unwrap();
+            assert!(mt_setting_parse_i32(neg.as_ptr(), &mut out_val));
+            assert_eq!(out_val, -10);
+
+            let invalid = CString::new("not_a_number").unwrap();
+            assert!(!mt_setting_parse_i32(invalid.as_ptr(), &mut out_val));
+        }
+    }
+
+    #[test]
+    fn test_setting_parse_f32() {
+        unsafe {
+            let mut out_val: f32 = 0.0;
+
+            let val = CString::new("3.14").unwrap();
+            assert!(mt_setting_parse_f32(val.as_ptr(), &mut out_val));
+            assert!((out_val - 3.14).abs() < 0.001);
+
+            let invalid = CString::new("invalid").unwrap();
+            assert!(!mt_setting_parse_f32(invalid.as_ptr(), &mut out_val));
+        }
+    }
+
+    #[test]
+    fn test_scrobble_record() {
+        unsafe {
+            let mut record = mt_scrobble_new();
+            assert_eq!(record.id, 0);
+            assert!(!record.submitted);
+
+            let artist = CString::new("The Beatles").unwrap();
+            mt_scrobble_set_artist(&mut record, artist.as_ptr());
+            assert_eq!(record.get_artist(), "The Beatles");
+
+            let track = CString::new("Hey Jude").unwrap();
+            mt_scrobble_set_track(&mut record, track.as_ptr());
+            assert_eq!(record.get_track(), "Hey Jude");
+
+            let album = CString::new("Past Masters").unwrap();
+            mt_scrobble_set_album(&mut record, album.as_ptr());
+            assert_eq!(record.get_album(), "Past Masters");
+        }
+    }
+
+    #[test]
+    fn test_scrobble_eligibility() {
+        unsafe {
+            // 4 minutes played on 10 minute track - eligible
+            assert!(mt_scrobble_is_eligible(240, 600));
+
+            // 2 minutes played on 3 minute track - eligible (>50%)
+            assert!(mt_scrobble_is_eligible(120, 180));
+
+            // 1 minute played on 10 minute track - not eligible
+            assert!(!mt_scrobble_is_eligible(60, 600));
+
+            // Edge cases
+            assert!(!mt_scrobble_is_eligible(0, 300));
+            assert!(!mt_scrobble_is_eligible(300, 0));
+        }
+    }
+
+    #[test]
+    fn test_watched_folder() {
+        unsafe {
+            let mut folder = mt_watched_folder_new();
+            assert!(folder.enabled);
+
+            let path = CString::new("/home/user/music").unwrap();
+            mt_watched_folder_set_path(&mut folder, path.as_ptr());
+            assert_eq!(folder.get_path(), "/home/user/music");
+
+            mt_watched_folder_set_scan_mode(&mut folder, 2); // watch mode
+            assert_eq!(folder.scan_mode, 2);
+        }
+    }
+
+    #[test]
+    fn test_queue_item() {
+        unsafe {
+            let mut item = mt_queue_item_new();
+            assert_eq!(item.id, 0);
+
+            let path = CString::new("/music/song.flac").unwrap();
+            mt_queue_item_set_filepath(&mut item, path.as_ptr());
+            assert_eq!(item.get_filepath(), "/music/song.flac");
+        }
+    }
+
+    #[test]
+    fn test_queue_snapshot() {
+        unsafe {
+            let snapshot = mt_queue_snapshot_new();
+            assert_eq!(snapshot.current_position, 0);
+            assert_eq!(snapshot.total_items, 0);
+            assert!(!snapshot.shuffle_enabled);
+            assert_eq!(snapshot.repeat_mode, 0); // off
+        }
+    }
+
+    // ========================================================================
+    // Last.fm FFI Tests
+    // ========================================================================
+
+    #[test]
+    fn test_lastfm_scrobble_request() {
+        unsafe {
+            let mut req = mt_lastfm_scrobble_request_new();
+            assert_eq!(req.artist_len, 0);
+            assert_eq!(req.track_len, 0);
+            assert_eq!(req.timestamp, 0);
+
+            let artist = CString::new("The Beatles").unwrap();
+            mt_lastfm_scrobble_set_artist(&mut req, artist.as_ptr());
+            assert_eq!(req.get_artist(), "The Beatles");
+
+            let track = CString::new("Hey Jude").unwrap();
+            mt_lastfm_scrobble_set_track(&mut req, track.as_ptr());
+            assert_eq!(req.get_track(), "Hey Jude");
+
+            let album = CString::new("White Album").unwrap();
+            mt_lastfm_scrobble_set_album(&mut req, album.as_ptr());
+            assert_eq!(req.get_album(), "White Album");
+
+            mt_lastfm_scrobble_set_timestamp(&mut req, 1234567890);
+            assert_eq!(req.timestamp, 1234567890);
+
+            mt_lastfm_scrobble_set_duration(&mut req, 240);
+            assert_eq!(req.duration, 240);
+
+            mt_lastfm_scrobble_set_track_number(&mut req, 5);
+            assert_eq!(req.track_number, 5);
+        }
+    }
+
+    #[test]
+    fn test_lastfm_now_playing_request() {
+        unsafe {
+            let mut req = mt_lastfm_now_playing_request_new();
+            assert_eq!(req.artist_len, 0);
+            assert_eq!(req.track_len, 0);
+
+            let artist = CString::new("Pink Floyd").unwrap();
+            mt_lastfm_now_playing_set_artist(&mut req, artist.as_ptr());
+            assert_eq!(req.get_artist(), "Pink Floyd");
+
+            let track = CString::new("Comfortably Numb").unwrap();
+            mt_lastfm_now_playing_set_track(&mut req, track.as_ptr());
+            assert_eq!(req.get_track(), "Comfortably Numb");
+
+            let album = CString::new("The Wall").unwrap();
+            mt_lastfm_now_playing_set_album(&mut req, album.as_ptr());
+            assert_eq!(req.get_album(), "The Wall");
+
+            mt_lastfm_now_playing_set_duration(&mut req, 382);
+            assert_eq!(req.duration, 382);
+
+            mt_lastfm_now_playing_set_track_number(&mut req, 6);
+            assert_eq!(req.track_number, 6);
+        }
+    }
+
+    #[test]
+    fn test_lastfm_client_lifecycle() {
+        unsafe {
+            let api_key = CString::new("test_api_key").unwrap();
+            let api_secret = CString::new("test_api_secret").unwrap();
+
+            let client = mt_lastfm_client_new(api_key.as_ptr(), api_secret.as_ptr());
+            assert!(!client.is_null());
+
+            // Initially not authenticated
+            assert!(!mt_lastfm_client_is_authenticated(client));
+
+            // Set session key
+            let session_key = CString::new("test_session_key").unwrap();
+            mt_lastfm_client_set_session_key(client, session_key.as_ptr());
+            assert!(mt_lastfm_client_is_authenticated(client));
+
+            // Clear session key
+            mt_lastfm_client_clear_session_key(client);
+            assert!(!mt_lastfm_client_is_authenticated(client));
+
+            mt_lastfm_client_free(client);
+        }
+    }
+
+    #[test]
+    fn test_lastfm_client_build_scrobble() {
+        unsafe {
+            let api_key = CString::new("test_api_key").unwrap();
+            let api_secret = CString::new("test_api_secret").unwrap();
+
+            let client = mt_lastfm_client_new(api_key.as_ptr(), api_secret.as_ptr());
+            assert!(!client.is_null());
+
+            // Set session key for authenticated requests
+            let session_key = CString::new("test_session").unwrap();
+            mt_lastfm_client_set_session_key(client, session_key.as_ptr());
+
+            // Create scrobble request
+            let mut scrobble = mt_lastfm_scrobble_request_new();
+            let artist = CString::new("Test Artist").unwrap();
+            let track = CString::new("Test Track").unwrap();
+            mt_lastfm_scrobble_set_artist(&mut scrobble, artist.as_ptr());
+            mt_lastfm_scrobble_set_track(&mut scrobble, track.as_ptr());
+            mt_lastfm_scrobble_set_timestamp(&mut scrobble, 1234567890);
+
+            // Build request
+            let mut built_request = mt_lastfm_built_request_new();
+            let success = mt_lastfm_client_build_scrobble(client, &scrobble, &mut built_request);
+            assert!(success);
+            assert!(built_request.body_len > 0);
+            assert_eq!(built_request.get_api_method(), "track.scrobble");
+            assert_eq!(built_request.get_method(), "POST");
+
+            // Verify body contains expected params
+            let body = built_request.get_body();
+            assert!(body.contains("api_key=test_api_key"));
+            assert!(body.contains("method=track.scrobble"));
+            assert!(body.contains("api_sig="));
+            assert!(body.contains("format=json"));
+
+            mt_lastfm_client_free(client);
+        }
+    }
+
+    #[test]
+    fn test_lastfm_client_rate_limiting() {
+        unsafe {
+            let api_key = CString::new("test_api_key").unwrap();
+            let api_secret = CString::new("test_api_secret").unwrap();
+
+            let client = mt_lastfm_client_new(api_key.as_ptr(), api_secret.as_ptr());
+            assert!(!client.is_null());
+
+            // First request should have no wait
+            let wait_time = mt_lastfm_client_get_wait_time_ns(client);
+            assert!(wait_time == 0 || wait_time < 1_000_000); // less than 1ms
+
+            mt_lastfm_client_free(client);
+        }
+    }
+
+    #[test]
+    fn test_lastfm_response() {
+        unsafe {
+            // Test success response
+            let success_resp = mt_lastfm_response_success();
+            assert!(success_resp.success);
+            assert_eq!(success_resp.error_code, 0);
+
+            // Test error response
+            let message = CString::new("Authentication Failed").unwrap();
+            let error_resp = mt_lastfm_response_error(4, message.as_ptr());
+            assert!(!error_resp.success);
+            assert_eq!(error_resp.error_code, 4);
+            assert_eq!(error_resp.get_error_message(), "Authentication Failed");
+        }
+    }
+
+    #[test]
+    fn test_lastfm_built_request() {
+        unsafe {
+            let req = mt_lastfm_built_request_new();
+            assert_eq!(req.body_len, 0);
+            assert_eq!(req.get_method(), "POST");
+        }
+    }
+
+    #[test]
+    fn test_lastfm_api_url() {
+        unsafe {
+            let url_ptr = mt_lastfm_get_api_url();
+            let url = CStr::from_ptr(url_ptr).to_str().unwrap();
+            assert!(url.starts_with("https://ws.audioscrobbler.com"));
+        }
+    }
+}
diff --git a/crates/mt-core/src/lib.rs b/crates/mt-core/src/lib.rs
new file mode 100644
index 0000000..4c0df72
--- /dev/null
+++ b/crates/mt-core/src/lib.rs
@@ -0,0 +1,59 @@
+//! mt-core: Core library for mt music player
+//!
+//! This crate contains the Zig FFI bindings and types that are shared
+//! between the core library and Tauri application.
+//!
+//! # Architecture
+//!
+//! The crate is organized as follows:
+//! - `ffi`: FFI bindings to the Zig mtcore library
+//!
+//! # Usage
+//!
+//! ```ignore
+//! use mt_core::ffi;
+//!
+//! // Use FFI types
+//! let fp = ffi::FileFingerprint { ... };
+//!
+//! // Call FFI functions (unsafe)
+//! unsafe {
+//!     let version = ffi::mt_version();
+//! }
+//! ```
+
+pub mod ffi;
+
+// Re-export commonly used types at crate root for convenience
+pub use ffi::{
+    // Core types
+    FileFingerprint,
+    ExtractedMetadata,
+    ScanStats,
+
+    // Artwork cache
+    FfiArtwork,
+    ArtworkCacheHandle,
+
+    // Inventory scanner
+    InventoryScannerHandle,
+    InventoryProgressCallback,
+
+    // Database models
+    Track,
+    Playlist,
+    QueueItem,
+    SearchParams,
+    QueueSnapshot,
+    PlaylistInfo,
+    SettingEntry,
+    ScrobbleRecord,
+    WatchedFolderFFI,
+
+    // Last.fm types
+    LastfmScrobbleRequest,
+    LastfmNowPlayingRequest,
+    LastfmBuiltRequest,
+    LastfmApiResponse,
+    LastfmClient,
+};
diff --git a/src-tauri/.cargo/config.toml b/crates/mt-tauri/.cargo/config.toml
similarity index 100%
rename from src-tauri/.cargo/config.toml
rename to crates/mt-tauri/.cargo/config.toml
diff --git a/src-tauri/Cargo.lock b/crates/mt-tauri/Cargo.lock
similarity index 94%
rename from src-tauri/Cargo.lock
rename to crates/mt-tauri/Cargo.lock
index 522c429..96ba688 100644
--- a/src-tauri/Cargo.lock
+++ b/crates/mt-tauri/Cargo.lock
@@ -371,13 +371,22 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "block2"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c132eebf10f5cad5289222520a4a058514204aed6d791f1cf4fe8088b82d15f"
+dependencies = [
+ "objc2 0.5.2",
+]
+
 [[package]]
 name = "block2"
 version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cdeb9d870516001442e364c5220d3574d2da8dc765554b4a617230d33fa58ef5"
 dependencies = [
- "objc2",
+ "objc2 0.6.3",
 ]
 
 [[package]]
@@ -432,6 +441,12 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
+[[package]]
+name = "byteorder-lite"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f1fe948ff07f4bd06c30984e69f5b4899c516a3ef74f34df92a2df2ab535495"
+
 [[package]]
 name = "bytes"
 version = "1.11.0"
@@ -1058,9 +1073,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "89a09f22a6c6069a18470eb92d2298acf25463f14256d24778e1230d789a2aec"
 dependencies = [
  "bitflags 2.10.0",
- "block2",
+ "block2 0.6.2",
  "libc",
- "objc2",
+ "objc2 0.6.3",
 ]
 
 [[package]]
@@ -1756,8 +1771,8 @@ checksum = "b9247516746aa8e53411a0db9b62b0e24efbcf6a76e0ba73e5a91b512ddabed7"
 dependencies = [
  "crossbeam-channel",
  "keyboard-types",
- "objc2",
- "objc2-app-kit",
+ "objc2 0.6.3",
+ "objc2-app-kit 0.3.2",
  "once_cell",
  "serde",
  "thiserror 2.0.17",
@@ -2158,7 +2173,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cc50b891e4acf8fe0e71ef88ec43ad82ee07b3810ad09de10f1d01f072ed4b98"
 dependencies = [
  "byteorder",
- "png",
+ "png 0.17.16",
 ]
 
 [[package]]
@@ -2269,6 +2284,21 @@ dependencies = [
  "icu_properties",
 ]
 
+[[package]]
+name = "image"
+version = "0.25.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6506c6c10786659413faa717ceebcb8f70731c0a60cbae39795fdf114519c1a"
+dependencies = [
+ "bytemuck",
+ "byteorder-lite",
+ "moxcms",
+ "num-traits",
+ "png 0.18.0",
+ "zune-core",
+ "zune-jpeg",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.9.3"
@@ -2760,6 +2790,16 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "moxcms"
+version = "0.7.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac9557c559cd6fc9867e122e20d2cbefc9ca29d80d027a8e39310920ed2f0a97"
+dependencies = [
+ "num-traits",
+ "pxfm",
+]
+
 [[package]]
 name = "mt"
 version = "0.1.0"
@@ -2771,6 +2811,7 @@ dependencies = [
  "md5",
  "notify-debouncer-full",
  "parking_lot",
+ "pkg-config",
  "proptest",
  "r2d2",
  "r2d2_sqlite",
@@ -2788,6 +2829,7 @@ dependencies = [
  "tauri-plugin-devtools",
  "tauri-plugin-dialog",
  "tauri-plugin-global-shortcut",
+ "tauri-plugin-mcp-bridge",
  "tauri-plugin-opener",
  "tauri-plugin-shell",
  "tauri-plugin-store",
@@ -2808,12 +2850,12 @@ dependencies = [
  "dpi",
  "gtk",
  "keyboard-types",
- "objc2",
- "objc2-app-kit",
+ "objc2 0.6.3",
+ "objc2-app-kit 0.3.2",
  "objc2-core-foundation",
- "objc2-foundation",
+ "objc2-foundation 0.3.2",
  "once_cell",
- "png",
+ "png 0.17.16",
  "serde",
  "thiserror 2.0.17",
  "windows-sys 0.60.2",
@@ -3036,6 +3078,22 @@ dependencies = [
  "malloc_buf",
 ]
 
+[[package]]
+name = "objc-sys"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb91bdd390c7ce1a8607f35f3ca7151b65afc0ff5ff3b34fa350f7d7c7e4310"
+
+[[package]]
+name = "objc2"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46a785d4eeff09c14c487497c162e92766fbb3e4059a71840cecc03d9a50b804"
+dependencies = [
+ "objc-sys",
+ "objc2-encode",
+]
+
 [[package]]
 name = "objc2"
 version = "0.6.3"
@@ -3046,6 +3104,22 @@ dependencies = [
  "objc2-exception-helper",
 ]
 
+[[package]]
+name = "objc2-app-kit"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e4e89ad9e3d7d297152b17d39ed92cd50ca8063a89a9fa569046d41568891eff"
+dependencies = [
+ "bitflags 2.10.0",
+ "block2 0.5.1",
+ "libc",
+ "objc2 0.5.2",
+ "objc2-core-data 0.2.2",
+ "objc2-core-image 0.2.2",
+ "objc2-foundation 0.2.2",
+ "objc2-quartz-core 0.2.2",
+]
+
 [[package]]
 name = "objc2-app-kit"
 version = "0.3.2"
@@ -3053,18 +3127,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d49e936b501e5c5bf01fda3a9452ff86dc3ea98ad5f283e1455153142d97518c"
 dependencies = [
  "bitflags 2.10.0",
- "block2",
+ "block2 0.6.2",
  "libc",
- "objc2",
- "objc2-cloud-kit",
- "objc2-core-data",
+ "objc2 0.6.3",
+ "objc2-cloud-kit 0.3.2",
+ "objc2-core-data 0.3.2",
  "objc2-core-foundation",
  "objc2-core-graphics",
- "objc2-core-image",
+ "objc2-core-image 0.3.2",
  "objc2-core-text",
  "objc2-core-video",
- "objc2-foundation",
- "objc2-quartz-core",
+ "objc2-foundation 0.3.2",
+ "objc2-quartz-core 0.3.2",
 ]
 
 [[package]]
@@ -3075,11 +3149,24 @@ checksum = "6948501a91121d6399b79abaa33a8aa4ea7857fe019f341b8c23ad6e81b79b08"
 dependencies = [
  "bitflags 2.10.0",
  "libc",
- "objc2",
+ "objc2 0.6.3",
  "objc2-core-audio",
  "objc2-core-audio-types",
  "objc2-core-foundation",
- "objc2-foundation",
+ "objc2-foundation 0.3.2",
+]
+
+[[package]]
+name = "objc2-cloud-kit"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74dd3b56391c7a0596a295029734d3c1c5e7e510a4cb30245f8221ccea96b009"
+dependencies = [
+ "bitflags 2.10.0",
+ "block2 0.5.1",
+ "objc2 0.5.2",
+ "objc2-core-location",
+ "objc2-foundation 0.2.2",
 ]
 
 [[package]]
@@ -3089,8 +3176,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "73ad74d880bb43877038da939b7427bba67e9dd42004a18b809ba7d87cee241c"
 dependencies = [
  "bitflags 2.10.0",
- "objc2",
- "objc2-foundation",
+ "objc2 0.6.3",
+ "objc2-foundation 0.3.2",
+]
+
+[[package]]
+name = "objc2-contacts"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a5ff520e9c33812fd374d8deecef01d4a840e7b41862d849513de77e44aa4889"
+dependencies = [
+ "block2 0.5.1",
+ "objc2 0.5.2",
+ "objc2-foundation 0.2.2",
 ]
 
 [[package]]
@@ -3100,7 +3198,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e1eebcea8b0dbff5f7c8504f3107c68fc061a3eb44932051c8cf8a68d969c3b2"
 dependencies = [
  "dispatch2",
- "objc2",
+ "objc2 0.6.3",
  "objc2-core-audio-types",
  "objc2-core-foundation",
 ]
@@ -3112,7 +3210,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5a89f2ec274a0cf4a32642b2991e8b351a404d290da87bb6a9a9d8632490bd1c"
 dependencies = [
  "bitflags 2.10.0",
- "objc2",
+ "objc2 0.6.3",
+]
+
+[[package]]
+name = "objc2-core-data"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "617fbf49e071c178c0b24c080767db52958f716d9eabdf0890523aeae54773ef"
+dependencies = [
+ "bitflags 2.10.0",
+ "block2 0.5.1",
+ "objc2 0.5.2",
+ "objc2-foundation 0.2.2",
 ]
 
 [[package]]
@@ -3122,8 +3232,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b402a653efbb5e82ce4df10683b6b28027616a2715e90009947d50b8dd298fa"
 dependencies = [
  "bitflags 2.10.0",
- "objc2",
- "objc2-foundation",
+ "objc2 0.6.3",
+ "objc2-foundation 0.3.2",
 ]
 
 [[package]]
@@ -3134,7 +3244,7 @@ checksum = "2a180dd8642fa45cdb7dd721cd4c11b1cadd4929ce112ebd8b9f5803cc79d536"
 dependencies = [
  "bitflags 2.10.0",
  "dispatch2",
- "objc2",
+ "objc2 0.6.3",
 ]
 
 [[package]]
@@ -3145,19 +3255,43 @@ checksum = "e022c9d066895efa1345f8e33e584b9f958da2fd4cd116792e15e07e4720a807"
 dependencies = [
  "bitflags 2.10.0",
  "dispatch2",
- "objc2",
+ "objc2 0.6.3",
  "objc2-core-foundation",
  "objc2-io-surface",
 ]
 
+[[package]]
+name = "objc2-core-image"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55260963a527c99f1819c4f8e3b47fe04f9650694ef348ffd2227e8196d34c80"
+dependencies = [
+ "block2 0.5.1",
+ "objc2 0.5.2",
+ "objc2-foundation 0.2.2",
+ "objc2-metal",
+]
+
 [[package]]
 name = "objc2-core-image"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e5d563b38d2b97209f8e861173de434bd0214cf020e3423a52624cd1d989f006"
 dependencies = [
- "objc2",
- "objc2-foundation",
+ "objc2 0.6.3",
+ "objc2-foundation 0.3.2",
+]
+
+[[package]]
+name = "objc2-core-location"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "000cfee34e683244f284252ee206a27953279d370e309649dc3ee317b37e5781"
+dependencies = [
+ "block2 0.5.1",
+ "objc2 0.5.2",
+ "objc2-contacts",
+ "objc2-foundation 0.2.2",
 ]
 
 [[package]]
@@ -3167,7 +3301,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0cde0dfb48d25d2b4862161a4d5fcc0e3c24367869ad306b0c9ec0073bfed92d"
 dependencies = [
  "bitflags 2.10.0",
- "objc2",
+ "objc2 0.6.3",
  "objc2-core-foundation",
  "objc2-core-graphics",
 ]
@@ -3179,7 +3313,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d425caf1df73233f29fd8a5c3e5edbc30d2d4307870f802d18f00d83dc5141a6"
 dependencies = [
  "bitflags 2.10.0",
- "objc2",
+ "objc2 0.6.3",
  "objc2-core-foundation",
  "objc2-core-graphics",
  "objc2-io-surface",
@@ -3200,6 +3334,18 @@ dependencies = [
  "cc",
 ]
 
+[[package]]
+name = "objc2-foundation"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ee638a5da3799329310ad4cfa62fbf045d5f56e3ef5ba4149e7452dcf89d5a8"
+dependencies = [
+ "bitflags 2.10.0",
+ "block2 0.5.1",
+ "libc",
+ "objc2 0.5.2",
+]
+
 [[package]]
 name = "objc2-foundation"
 version = "0.3.2"
@@ -3207,9 +3353,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3e0adef53c21f888deb4fa59fc59f7eb17404926ee8a6f59f5df0fd7f9f3272"
 dependencies = [
  "bitflags 2.10.0",
- "block2",
+ "block2 0.6.2",
  "libc",
- "objc2",
+ "objc2 0.6.3",
  "objc2-core-foundation",
 ]
 
@@ -3220,7 +3366,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "180788110936d59bab6bd83b6060ffdfffb3b922ba1396b312ae795e1de9d81d"
 dependencies = [
  "bitflags 2.10.0",
- "objc2",
+ "objc2 0.6.3",
  "objc2-core-foundation",
 ]
 
@@ -3230,10 +3376,47 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a1e6550c4caed348956ce3370c9ffeca70bb1dbed4fa96112e7c6170e074586"
 dependencies = [
- "objc2",
+ "objc2 0.6.3",
  "objc2-core-foundation",
 ]
 
+[[package]]
+name = "objc2-link-presentation"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1a1ae721c5e35be65f01a03b6d2ac13a54cb4fa70d8a5da293d7b0020261398"
+dependencies = [
+ "block2 0.5.1",
+ "objc2 0.5.2",
+ "objc2-app-kit 0.2.2",
+ "objc2-foundation 0.2.2",
+]
+
+[[package]]
+name = "objc2-metal"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dd0cba1276f6023976a406a14ffa85e1fdd19df6b0f737b063b95f6c8c7aadd6"
+dependencies = [
+ "bitflags 2.10.0",
+ "block2 0.5.1",
+ "objc2 0.5.2",
+ "objc2-foundation 0.2.2",
+]
+
+[[package]]
+name = "objc2-quartz-core"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e42bee7bff906b14b167da2bac5efe6b6a07e6f7c0a21a7308d40c960242dc7a"
+dependencies = [
+ "bitflags 2.10.0",
+ "block2 0.5.1",
+ "objc2 0.5.2",
+ "objc2-foundation 0.2.2",
+ "objc2-metal",
+]
+
 [[package]]
 name = "objc2-quartz-core"
 version = "0.3.2"
@@ -3241,9 +3424,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "96c1358452b371bf9f104e21ec536d37a650eb10f7ee379fff67d2e08d537f1f"
 dependencies = [
  "bitflags 2.10.0",
- "objc2",
+ "objc2 0.6.3",
  "objc2-core-foundation",
- "objc2-foundation",
+ "objc2-foundation 0.3.2",
 ]
 
 [[package]]
@@ -3253,10 +3436,41 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "709fe137109bd1e8b5a99390f77a7d8b2961dafc1a1c5db8f2e60329ad6d895a"
 dependencies = [
  "bitflags 2.10.0",
- "objc2",
+ "objc2 0.6.3",
  "objc2-core-foundation",
 ]
 
+[[package]]
+name = "objc2-symbols"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0a684efe3dec1b305badae1a28f6555f6ddd3bb2c2267896782858d5a78404dc"
+dependencies = [
+ "objc2 0.5.2",
+ "objc2-foundation 0.2.2",
+]
+
+[[package]]
+name = "objc2-ui-kit"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8bb46798b20cd6b91cbd113524c490f1686f4c4e8f49502431415f3512e2b6f"
+dependencies = [
+ "bitflags 2.10.0",
+ "block2 0.5.1",
+ "objc2 0.5.2",
+ "objc2-cloud-kit 0.2.2",
+ "objc2-core-data 0.2.2",
+ "objc2-core-image 0.2.2",
+ "objc2-core-location",
+ "objc2-foundation 0.2.2",
+ "objc2-link-presentation",
+ "objc2-quartz-core 0.2.2",
+ "objc2-symbols",
+ "objc2-uniform-type-identifiers",
+ "objc2-user-notifications",
+]
+
 [[package]]
 name = "objc2-ui-kit"
 version = "0.3.2"
@@ -3264,9 +3478,46 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d87d638e33c06f577498cbcc50491496a3ed4246998a7fbba7ccb98b1e7eab22"
 dependencies = [
  "bitflags 2.10.0",
- "objc2",
+ "objc2 0.6.3",
  "objc2-core-foundation",
- "objc2-foundation",
+ "objc2-foundation 0.3.2",
+]
+
+[[package]]
+name = "objc2-uniform-type-identifiers"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44fa5f9748dbfe1ca6c0b79ad20725a11eca7c2218bceb4b005cb1be26273bfe"
+dependencies = [
+ "block2 0.5.1",
+ "objc2 0.5.2",
+ "objc2-foundation 0.2.2",
+]
+
+[[package]]
+name = "objc2-user-notifications"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76cfcbf642358e8689af64cee815d139339f3ed8ad05103ed5eaf73db8d84cb3"
+dependencies = [
+ "bitflags 2.10.0",
+ "block2 0.5.1",
+ "objc2 0.5.2",
+ "objc2-core-location",
+ "objc2-foundation 0.2.2",
+]
+
+[[package]]
+name = "objc2-web-kit"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68bc69301064cebefc6c4c90ce9cba69225239e4b8ff99d445a2b5563797da65"
+dependencies = [
+ "bitflags 2.10.0",
+ "block2 0.5.1",
+ "objc2 0.5.2",
+ "objc2-app-kit 0.2.2",
+ "objc2-foundation 0.2.2",
 ]
 
 [[package]]
@@ -3276,11 +3527,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b2e5aaab980c433cf470df9d7af96a7b46a9d892d521a2cbbb2f8a4c16751e7f"
 dependencies = [
  "bitflags 2.10.0",
- "block2",
- "objc2",
- "objc2-app-kit",
+ "block2 0.6.2",
+ "objc2 0.6.3",
+ "objc2-app-kit 0.3.2",
  "objc2-core-foundation",
- "objc2-foundation",
+ "objc2-foundation 0.3.2",
  "objc2-javascript-core",
  "objc2-security",
 ]
@@ -3663,6 +3914,19 @@ dependencies = [
  "miniz_oxide",
 ]
 
+[[package]]
+name = "png"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97baced388464909d42d89643fe4361939af9b7ce7a31ee32a168f832a70f2a0"
+dependencies = [
+ "bitflags 2.10.0",
+ "crc32fast",
+ "fdeflate",
+ "flate2",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "polling"
 version = "3.11.0"
@@ -3841,6 +4105,15 @@ dependencies = [
  "prost",
 ]
 
+[[package]]
+name = "pxfm"
+version = "0.1.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7186d3822593aa4393561d186d1393b3923e9d6163d3fbfd6e825e3e6cf3e6a8"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "quick-error"
 version = "1.2.3"
@@ -4157,17 +4430,17 @@ version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a15ad77d9e70a92437d8f74c35d99b4e4691128df018833e99f90bcd36152672"
 dependencies = [
- "block2",
+ "block2 0.6.2",
  "dispatch2",
  "glib-sys",
  "gobject-sys",
  "gtk-sys",
  "js-sys",
  "log",
- "objc2",
- "objc2-app-kit",
+ "objc2 0.6.3",
+ "objc2-app-kit 0.3.2",
  "objc2-core-foundation",
- "objc2-foundation",
+ "objc2-foundation 0.3.2",
  "raw-window-handle",
  "wasm-bindgen",
  "wasm-bindgen-futures",
@@ -4621,6 +4894,17 @@ dependencies = [
  "stable_deref_trait",
 ]
 
+[[package]]
+name = "sha1"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3bf829a2d51ab4a5ddf1352d8470c140cadc8301b2ae1789db023f01cedd6ba"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
 [[package]]
 name = "sha2"
 version = "0.10.9"
@@ -4748,11 +5032,11 @@ dependencies = [
  "bytemuck",
  "js-sys",
  "ndk",
- "objc2",
+ "objc2 0.6.3",
  "objc2-core-foundation",
  "objc2-core-graphics",
- "objc2-foundation",
- "objc2-quartz-core",
+ "objc2-foundation 0.3.2",
+ "objc2-quartz-core 0.3.2",
  "raw-window-handle",
  "redox_syscall",
  "tracing",
@@ -5107,7 +5391,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f3a753bdc39c07b192151523a3f77cd0394aa75413802c883a0f6f6a0e5ee2e7"
 dependencies = [
  "bitflags 2.10.0",
- "block2",
+ "block2 0.6.2",
  "core-foundation 0.10.1",
  "core-graphics 0.24.0",
  "crossbeam-channel",
@@ -5124,9 +5408,9 @@ dependencies = [
  "ndk",
  "ndk-context",
  "ndk-sys",
- "objc2",
- "objc2-app-kit",
- "objc2-foundation",
+ "objc2 0.6.3",
+ "objc2-app-kit 0.3.2",
+ "objc2-foundation 0.3.2",
  "once_cell",
  "parking_lot",
  "raw-window-handle",
@@ -5179,11 +5463,11 @@ dependencies = [
  "log",
  "mime",
  "muda",
- "objc2",
- "objc2-app-kit",
- "objc2-foundation",
- "objc2-ui-kit",
- "objc2-web-kit",
+ "objc2 0.6.3",
+ "objc2-app-kit 0.3.2",
+ "objc2-foundation 0.3.2",
+ "objc2-ui-kit 0.3.2",
+ "objc2-web-kit 0.3.2",
  "percent-encoding",
  "plist",
  "raw-window-handle",
@@ -5242,7 +5526,7 @@ dependencies = [
  "ico",
  "json-patch",
  "plist",
- "png",
+ "png 0.17.16",
  "proc-macro2",
  "quote",
  "semver",
@@ -5371,6 +5655,35 @@ dependencies = [
  "thiserror 2.0.17",
 ]
 
+[[package]]
+name = "tauri-plugin-mcp-bridge"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4cae134e7f07b0ad6e5c9019a6cf8b74382439e23f13aaa5df21538732fa480c"
+dependencies = [
+ "base64 0.22.1",
+ "block2 0.5.1",
+ "futures-util",
+ "image",
+ "jni",
+ "objc2 0.5.2",
+ "objc2-app-kit 0.2.2",
+ "objc2-foundation 0.2.2",
+ "objc2-ui-kit 0.2.2",
+ "objc2-web-kit 0.2.2",
+ "serde",
+ "serde_json",
+ "tauri",
+ "tauri-plugin",
+ "thiserror 1.0.69",
+ "tokio",
+ "tokio-tungstenite",
+ "uuid",
+ "webview2-com",
+ "windows 0.61.3",
+ "windows-core 0.61.2",
+]
+
 [[package]]
 name = "tauri-plugin-opener"
 version = "2.5.3"
@@ -5379,8 +5692,8 @@ checksum = "fc624469b06f59f5a29f874bbc61a2ed737c0f9c23ef09855a292c389c42e83f"
 dependencies = [
  "dunce",
  "glob",
- "objc2-app-kit",
- "objc2-foundation",
+ "objc2-app-kit 0.3.2",
+ "objc2-foundation 0.3.2",
  "open",
  "schemars 0.8.22",
  "serde",
@@ -5441,9 +5754,9 @@ dependencies = [
  "gtk",
  "http 1.4.0",
  "jni",
- "objc2",
- "objc2-ui-kit",
- "objc2-web-kit",
+ "objc2 0.6.3",
+ "objc2-ui-kit 0.3.2",
+ "objc2-web-kit 0.3.2",
  "raw-window-handle",
  "serde",
  "serde_json",
@@ -5465,9 +5778,9 @@ dependencies = [
  "http 1.4.0",
  "jni",
  "log",
- "objc2",
- "objc2-app-kit",
- "objc2-foundation",
+ "objc2 0.6.3",
+ "objc2-app-kit 0.3.2",
+ "objc2-foundation 0.3.2",
  "once_cell",
  "percent-encoding",
  "raw-window-handle",
@@ -5655,7 +5968,9 @@ dependencies = [
  "bytes",
  "libc",
  "mio",
+ "parking_lot",
  "pin-project-lite",
+ "signal-hook-registry",
  "socket2 0.6.1",
  "tokio-macros",
  "windows-sys 0.61.2",
@@ -5713,6 +6028,18 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "tokio-tungstenite"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d25a406cddcc431a75d3d9afc6a7c0f7428d4891dd973e4d54c56b46127bf857"
+dependencies = [
+ "futures-util",
+ "log",
+ "tokio",
+ "tungstenite",
+]
+
 [[package]]
 name = "tokio-util"
 version = "0.7.18"
@@ -6037,13 +6364,13 @@ dependencies = [
  "dirs",
  "libappindicator",
  "muda",
- "objc2",
- "objc2-app-kit",
+ "objc2 0.6.3",
+ "objc2-app-kit 0.3.2",
  "objc2-core-foundation",
  "objc2-core-graphics",
- "objc2-foundation",
+ "objc2-foundation 0.3.2",
  "once_cell",
- "png",
+ "png 0.17.16",
  "serde",
  "thiserror 2.0.17",
  "windows-sys 0.60.2",
@@ -6055,6 +6382,23 @@ version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e421abadd41a4225275504ea4d6566923418b7f05506fbc9c0fe86ba7396114b"
 
+[[package]]
+name = "tungstenite"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8628dcc84e5a09eb3d8423d6cb682965dea9133204e8fb3efee74c2a0c259442"
+dependencies = [
+ "bytes",
+ "data-encoding",
+ "http 1.4.0",
+ "httparse",
+ "log",
+ "rand 0.9.2",
+ "sha1",
+ "thiserror 2.0.17",
+ "utf-8",
+]
+
 [[package]]
 name = "typeid"
 version = "1.0.3"
@@ -6484,10 +6828,10 @@ version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9bec5a31f3f9362f2258fd0e9c9dd61a9ca432e7306cc78c444258f0dce9a9c"
 dependencies = [
- "objc2",
- "objc2-app-kit",
+ "objc2 0.6.3",
+ "objc2-app-kit 0.3.2",
  "objc2-core-foundation",
- "objc2-foundation",
+ "objc2-foundation 0.3.2",
  "raw-window-handle",
  "windows-sys 0.59.0",
  "windows-version",
@@ -7043,7 +7387,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "728b7d4c8ec8d81cab295e0b5b8a4c263c0d41a785fb8f8c4df284e5411140a2"
 dependencies = [
  "base64 0.22.1",
- "block2",
+ "block2 0.6.2",
  "cookie",
  "crossbeam-channel",
  "dirs",
@@ -7058,12 +7402,12 @@ dependencies = [
  "kuchikiki",
  "libc",
  "ndk",
- "objc2",
- "objc2-app-kit",
+ "objc2 0.6.3",
+ "objc2-app-kit 0.3.2",
  "objc2-core-foundation",
- "objc2-foundation",
- "objc2-ui-kit",
- "objc2-web-kit",
+ "objc2-foundation 0.3.2",
+ "objc2-ui-kit 0.3.2",
+ "objc2-web-kit 0.3.2",
  "once_cell",
  "percent-encoding",
  "raw-window-handle",
@@ -7296,6 +7640,21 @@ version = "1.0.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac93432f5b761b22864c774aac244fa5c0fd877678a4c37ebf6cf42208f9c9ec"
 
+[[package]]
+name = "zune-core"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb8a0807f7c01457d0379ba880ba6322660448ddebc890ce29bb64da71fb40f9"
+
+[[package]]
+name = "zune-jpeg"
+version = "0.5.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2959ca473aae96a14ecedf501d20b3608d2825ba280d5adb57d651721885b0c2"
+dependencies = [
+ "zune-core",
+]
+
 [[package]]
 name = "zvariant"
 version = "5.9.1"
diff --git a/src-tauri/Cargo.toml b/crates/mt-tauri/Cargo.toml
similarity index 73%
rename from src-tauri/Cargo.toml
rename to crates/mt-tauri/Cargo.toml
index c612755..1dbe1fe 100644
--- a/src-tauri/Cargo.toml
+++ b/crates/mt-tauri/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "mt"
+name = "mt-tauri"
 version = "0.1.0"
 description = "Desktop music player for large collections"
 authors = ["pythoninthegrass"]
@@ -13,13 +13,24 @@ crate-type = ["staticlib", "cdylib", "rlib"]
 tauri-build = { version = "2", features = [] }
 
 [dependencies]
+# Workspace dependencies
+mt-core = { path = "../mt-core" }
+
+# Tauri framework
 tauri = { version = "2", features = [] }
 tauri-plugin-shell = "2"
 tauri-plugin-global-shortcut = "2"
 tauri-plugin-dialog = "2"
 tauri-plugin-opener = "2"
+tauri-plugin-store = "2"
+tauri-plugin-devtools = { version = "2", optional = true }
+tauri-plugin-mcp-bridge = { version = "0.8", optional = true }
+
+# Serialization
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
+
+# Async HTTP
 reqwest = { version = "0.12", features = ["blocking", "json"] }
 tokio = { version = "1", features = ["rt-multi-thread", "macros", "sync", "time", "fs", "io-util"] }
 
@@ -35,9 +46,6 @@ souvlaki = "0.8"
 # Audio metadata reading/writing
 lofty = "0.22"
 
-# Persistent key-value store
-tauri-plugin-store = "2"
-
 # Database
 rusqlite = { version = "0.38", features = ["bundled"] }
 r2d2 = "0.8"
@@ -57,10 +65,8 @@ walkdir = "2"
 rayon = "1.10"
 base64 = "0.22"
 
-tauri-plugin-devtools = { version = "2", optional = true }
+# Hashing
 sha2 = "0.10.9"
-
-# Last.fm integration
 md5 = "0.7"
 
 # LRU cache for artwork
@@ -69,23 +75,8 @@ lru = "0.12"
 [features]
 default = []
 devtools = ["dep:tauri-plugin-devtools", "tauri/devtools"]
+mcp = ["dep:tauri-plugin-mcp-bridge"]
 
 [dev-dependencies]
 tempfile = "3"
 proptest = "1.5"
-
-# Dev profile optimizations for faster local builds
-[profile.dev]
-split-debuginfo = "unpacked"  # macOS-specific: up to 70% faster incremental debug builds
-debug = "line-tables-only"    # Reduce debug info for faster builds (still get line numbers in backtraces)
-
-# Optimize build scripts and proc-macros even in dev mode
-[profile.dev.build-override]
-opt-level = 3  # Faster builds when proc-macros are dependencies (serde_derive, tauri macros)
-
-[profile.release]
-panic = "abort"
-codegen-units = 1
-lto = true
-opt-level = "s"
-strip = true
diff --git a/crates/mt-tauri/build.rs b/crates/mt-tauri/build.rs
new file mode 100644
index 0000000..11d9f58
--- /dev/null
+++ b/crates/mt-tauri/build.rs
@@ -0,0 +1,6 @@
+fn main() {
+    // The Zig library (libmtcore.a) is built and linked by the mt-core crate.
+    // Link directives from mt-core's build.rs propagate to this crate.
+    // We just need to run tauri_build here.
+    tauri_build::build()
+}
diff --git a/src-tauri/capabilities/default.json b/crates/mt-tauri/capabilities/default.json
similarity index 100%
rename from src-tauri/capabilities/default.json
rename to crates/mt-tauri/capabilities/default.json
diff --git a/src-tauri/dependency-audit.md b/crates/mt-tauri/dependency-audit.md
similarity index 100%
rename from src-tauri/dependency-audit.md
rename to crates/mt-tauri/dependency-audit.md
diff --git a/src-tauri/examples/audio_test.rs b/crates/mt-tauri/examples/audio_test.rs
similarity index 100%
rename from src-tauri/examples/audio_test.rs
rename to crates/mt-tauri/examples/audio_test.rs
diff --git a/src-tauri/gen/schemas/acl-manifests.json b/crates/mt-tauri/gen/schemas/acl-manifests.json
similarity index 100%
rename from src-tauri/gen/schemas/acl-manifests.json
rename to crates/mt-tauri/gen/schemas/acl-manifests.json
diff --git a/src-tauri/gen/schemas/capabilities.json b/crates/mt-tauri/gen/schemas/capabilities.json
similarity index 100%
rename from src-tauri/gen/schemas/capabilities.json
rename to crates/mt-tauri/gen/schemas/capabilities.json
diff --git a/src-tauri/gen/schemas/desktop-schema.json b/crates/mt-tauri/gen/schemas/desktop-schema.json
similarity index 100%
rename from src-tauri/gen/schemas/desktop-schema.json
rename to crates/mt-tauri/gen/schemas/desktop-schema.json
diff --git a/src-tauri/gen/schemas/macOS-schema.json b/crates/mt-tauri/gen/schemas/macOS-schema.json
similarity index 100%
rename from src-tauri/gen/schemas/macOS-schema.json
rename to crates/mt-tauri/gen/schemas/macOS-schema.json
diff --git a/src-tauri/icons/128x128.png b/crates/mt-tauri/icons/128x128.png
similarity index 100%
rename from src-tauri/icons/128x128.png
rename to crates/mt-tauri/icons/128x128.png
diff --git a/src-tauri/icons/128x128@2x.png b/crates/mt-tauri/icons/128x128@2x.png
similarity index 100%
rename from src-tauri/icons/128x128@2x.png
rename to crates/mt-tauri/icons/128x128@2x.png
diff --git a/src-tauri/icons/32x32.png b/crates/mt-tauri/icons/32x32.png
similarity index 100%
rename from src-tauri/icons/32x32.png
rename to crates/mt-tauri/icons/32x32.png
diff --git a/src-tauri/icons/64x64.png b/crates/mt-tauri/icons/64x64.png
similarity index 100%
rename from src-tauri/icons/64x64.png
rename to crates/mt-tauri/icons/64x64.png
diff --git a/src-tauri/icons/Square107x107Logo.png b/crates/mt-tauri/icons/Square107x107Logo.png
similarity index 100%
rename from src-tauri/icons/Square107x107Logo.png
rename to crates/mt-tauri/icons/Square107x107Logo.png
diff --git a/src-tauri/icons/Square142x142Logo.png b/crates/mt-tauri/icons/Square142x142Logo.png
similarity index 100%
rename from src-tauri/icons/Square142x142Logo.png
rename to crates/mt-tauri/icons/Square142x142Logo.png
diff --git a/src-tauri/icons/Square150x150Logo.png b/crates/mt-tauri/icons/Square150x150Logo.png
similarity index 100%
rename from src-tauri/icons/Square150x150Logo.png
rename to crates/mt-tauri/icons/Square150x150Logo.png
diff --git a/src-tauri/icons/Square284x284Logo.png b/crates/mt-tauri/icons/Square284x284Logo.png
similarity index 100%
rename from src-tauri/icons/Square284x284Logo.png
rename to crates/mt-tauri/icons/Square284x284Logo.png
diff --git a/src-tauri/icons/Square30x30Logo.png b/crates/mt-tauri/icons/Square30x30Logo.png
similarity index 100%
rename from src-tauri/icons/Square30x30Logo.png
rename to crates/mt-tauri/icons/Square30x30Logo.png
diff --git a/src-tauri/icons/Square310x310Logo.png b/crates/mt-tauri/icons/Square310x310Logo.png
similarity index 100%
rename from src-tauri/icons/Square310x310Logo.png
rename to crates/mt-tauri/icons/Square310x310Logo.png
diff --git a/src-tauri/icons/Square44x44Logo.png b/crates/mt-tauri/icons/Square44x44Logo.png
similarity index 100%
rename from src-tauri/icons/Square44x44Logo.png
rename to crates/mt-tauri/icons/Square44x44Logo.png
diff --git a/src-tauri/icons/Square71x71Logo.png b/crates/mt-tauri/icons/Square71x71Logo.png
similarity index 100%
rename from src-tauri/icons/Square71x71Logo.png
rename to crates/mt-tauri/icons/Square71x71Logo.png
diff --git a/src-tauri/icons/Square89x89Logo.png b/crates/mt-tauri/icons/Square89x89Logo.png
similarity index 100%
rename from src-tauri/icons/Square89x89Logo.png
rename to crates/mt-tauri/icons/Square89x89Logo.png
diff --git a/src-tauri/icons/StoreLogo.png b/crates/mt-tauri/icons/StoreLogo.png
similarity index 100%
rename from src-tauri/icons/StoreLogo.png
rename to crates/mt-tauri/icons/StoreLogo.png
diff --git a/src-tauri/icons/android/mipmap-anydpi-v26/ic_launcher.xml b/crates/mt-tauri/icons/android/mipmap-anydpi-v26/ic_launcher.xml
similarity index 100%
rename from src-tauri/icons/android/mipmap-anydpi-v26/ic_launcher.xml
rename to crates/mt-tauri/icons/android/mipmap-anydpi-v26/ic_launcher.xml
diff --git a/src-tauri/icons/android/mipmap-hdpi/ic_launcher.png b/crates/mt-tauri/icons/android/mipmap-hdpi/ic_launcher.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-hdpi/ic_launcher.png
rename to crates/mt-tauri/icons/android/mipmap-hdpi/ic_launcher.png
diff --git a/src-tauri/icons/android/mipmap-hdpi/ic_launcher_foreground.png b/crates/mt-tauri/icons/android/mipmap-hdpi/ic_launcher_foreground.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-hdpi/ic_launcher_foreground.png
rename to crates/mt-tauri/icons/android/mipmap-hdpi/ic_launcher_foreground.png
diff --git a/src-tauri/icons/android/mipmap-hdpi/ic_launcher_round.png b/crates/mt-tauri/icons/android/mipmap-hdpi/ic_launcher_round.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-hdpi/ic_launcher_round.png
rename to crates/mt-tauri/icons/android/mipmap-hdpi/ic_launcher_round.png
diff --git a/src-tauri/icons/android/mipmap-mdpi/ic_launcher.png b/crates/mt-tauri/icons/android/mipmap-mdpi/ic_launcher.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-mdpi/ic_launcher.png
rename to crates/mt-tauri/icons/android/mipmap-mdpi/ic_launcher.png
diff --git a/src-tauri/icons/android/mipmap-mdpi/ic_launcher_foreground.png b/crates/mt-tauri/icons/android/mipmap-mdpi/ic_launcher_foreground.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-mdpi/ic_launcher_foreground.png
rename to crates/mt-tauri/icons/android/mipmap-mdpi/ic_launcher_foreground.png
diff --git a/src-tauri/icons/android/mipmap-mdpi/ic_launcher_round.png b/crates/mt-tauri/icons/android/mipmap-mdpi/ic_launcher_round.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-mdpi/ic_launcher_round.png
rename to crates/mt-tauri/icons/android/mipmap-mdpi/ic_launcher_round.png
diff --git a/src-tauri/icons/android/mipmap-xhdpi/ic_launcher.png b/crates/mt-tauri/icons/android/mipmap-xhdpi/ic_launcher.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-xhdpi/ic_launcher.png
rename to crates/mt-tauri/icons/android/mipmap-xhdpi/ic_launcher.png
diff --git a/src-tauri/icons/android/mipmap-xhdpi/ic_launcher_foreground.png b/crates/mt-tauri/icons/android/mipmap-xhdpi/ic_launcher_foreground.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-xhdpi/ic_launcher_foreground.png
rename to crates/mt-tauri/icons/android/mipmap-xhdpi/ic_launcher_foreground.png
diff --git a/src-tauri/icons/android/mipmap-xhdpi/ic_launcher_round.png b/crates/mt-tauri/icons/android/mipmap-xhdpi/ic_launcher_round.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-xhdpi/ic_launcher_round.png
rename to crates/mt-tauri/icons/android/mipmap-xhdpi/ic_launcher_round.png
diff --git a/src-tauri/icons/android/mipmap-xxhdpi/ic_launcher.png b/crates/mt-tauri/icons/android/mipmap-xxhdpi/ic_launcher.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-xxhdpi/ic_launcher.png
rename to crates/mt-tauri/icons/android/mipmap-xxhdpi/ic_launcher.png
diff --git a/src-tauri/icons/android/mipmap-xxhdpi/ic_launcher_foreground.png b/crates/mt-tauri/icons/android/mipmap-xxhdpi/ic_launcher_foreground.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-xxhdpi/ic_launcher_foreground.png
rename to crates/mt-tauri/icons/android/mipmap-xxhdpi/ic_launcher_foreground.png
diff --git a/src-tauri/icons/android/mipmap-xxhdpi/ic_launcher_round.png b/crates/mt-tauri/icons/android/mipmap-xxhdpi/ic_launcher_round.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-xxhdpi/ic_launcher_round.png
rename to crates/mt-tauri/icons/android/mipmap-xxhdpi/ic_launcher_round.png
diff --git a/src-tauri/icons/android/mipmap-xxxhdpi/ic_launcher.png b/crates/mt-tauri/icons/android/mipmap-xxxhdpi/ic_launcher.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-xxxhdpi/ic_launcher.png
rename to crates/mt-tauri/icons/android/mipmap-xxxhdpi/ic_launcher.png
diff --git a/src-tauri/icons/android/mipmap-xxxhdpi/ic_launcher_foreground.png b/crates/mt-tauri/icons/android/mipmap-xxxhdpi/ic_launcher_foreground.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-xxxhdpi/ic_launcher_foreground.png
rename to crates/mt-tauri/icons/android/mipmap-xxxhdpi/ic_launcher_foreground.png
diff --git a/src-tauri/icons/android/mipmap-xxxhdpi/ic_launcher_round.png b/crates/mt-tauri/icons/android/mipmap-xxxhdpi/ic_launcher_round.png
similarity index 100%
rename from src-tauri/icons/android/mipmap-xxxhdpi/ic_launcher_round.png
rename to crates/mt-tauri/icons/android/mipmap-xxxhdpi/ic_launcher_round.png
diff --git a/src-tauri/icons/android/values/ic_launcher_background.xml b/crates/mt-tauri/icons/android/values/ic_launcher_background.xml
similarity index 100%
rename from src-tauri/icons/android/values/ic_launcher_background.xml
rename to crates/mt-tauri/icons/android/values/ic_launcher_background.xml
diff --git a/src-tauri/icons/icon.icns b/crates/mt-tauri/icons/icon.icns
similarity index 100%
rename from src-tauri/icons/icon.icns
rename to crates/mt-tauri/icons/icon.icns
diff --git a/src-tauri/icons/icon.ico b/crates/mt-tauri/icons/icon.ico
similarity index 100%
rename from src-tauri/icons/icon.ico
rename to crates/mt-tauri/icons/icon.ico
diff --git a/src-tauri/icons/icon.png b/crates/mt-tauri/icons/icon.png
similarity index 100%
rename from src-tauri/icons/icon.png
rename to crates/mt-tauri/icons/icon.png
diff --git a/src-tauri/icons/ios/AppIcon-20x20@1x.png b/crates/mt-tauri/icons/ios/AppIcon-20x20@1x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-20x20@1x.png
rename to crates/mt-tauri/icons/ios/AppIcon-20x20@1x.png
diff --git a/src-tauri/icons/ios/AppIcon-20x20@2x-1.png b/crates/mt-tauri/icons/ios/AppIcon-20x20@2x-1.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-20x20@2x-1.png
rename to crates/mt-tauri/icons/ios/AppIcon-20x20@2x-1.png
diff --git a/src-tauri/icons/ios/AppIcon-20x20@2x.png b/crates/mt-tauri/icons/ios/AppIcon-20x20@2x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-20x20@2x.png
rename to crates/mt-tauri/icons/ios/AppIcon-20x20@2x.png
diff --git a/src-tauri/icons/ios/AppIcon-20x20@3x.png b/crates/mt-tauri/icons/ios/AppIcon-20x20@3x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-20x20@3x.png
rename to crates/mt-tauri/icons/ios/AppIcon-20x20@3x.png
diff --git a/src-tauri/icons/ios/AppIcon-29x29@1x.png b/crates/mt-tauri/icons/ios/AppIcon-29x29@1x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-29x29@1x.png
rename to crates/mt-tauri/icons/ios/AppIcon-29x29@1x.png
diff --git a/src-tauri/icons/ios/AppIcon-29x29@2x-1.png b/crates/mt-tauri/icons/ios/AppIcon-29x29@2x-1.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-29x29@2x-1.png
rename to crates/mt-tauri/icons/ios/AppIcon-29x29@2x-1.png
diff --git a/src-tauri/icons/ios/AppIcon-29x29@2x.png b/crates/mt-tauri/icons/ios/AppIcon-29x29@2x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-29x29@2x.png
rename to crates/mt-tauri/icons/ios/AppIcon-29x29@2x.png
diff --git a/src-tauri/icons/ios/AppIcon-29x29@3x.png b/crates/mt-tauri/icons/ios/AppIcon-29x29@3x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-29x29@3x.png
rename to crates/mt-tauri/icons/ios/AppIcon-29x29@3x.png
diff --git a/src-tauri/icons/ios/AppIcon-40x40@1x.png b/crates/mt-tauri/icons/ios/AppIcon-40x40@1x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-40x40@1x.png
rename to crates/mt-tauri/icons/ios/AppIcon-40x40@1x.png
diff --git a/src-tauri/icons/ios/AppIcon-40x40@2x-1.png b/crates/mt-tauri/icons/ios/AppIcon-40x40@2x-1.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-40x40@2x-1.png
rename to crates/mt-tauri/icons/ios/AppIcon-40x40@2x-1.png
diff --git a/src-tauri/icons/ios/AppIcon-40x40@2x.png b/crates/mt-tauri/icons/ios/AppIcon-40x40@2x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-40x40@2x.png
rename to crates/mt-tauri/icons/ios/AppIcon-40x40@2x.png
diff --git a/src-tauri/icons/ios/AppIcon-40x40@3x.png b/crates/mt-tauri/icons/ios/AppIcon-40x40@3x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-40x40@3x.png
rename to crates/mt-tauri/icons/ios/AppIcon-40x40@3x.png
diff --git a/src-tauri/icons/ios/AppIcon-512@2x.png b/crates/mt-tauri/icons/ios/AppIcon-512@2x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-512@2x.png
rename to crates/mt-tauri/icons/ios/AppIcon-512@2x.png
diff --git a/src-tauri/icons/ios/AppIcon-60x60@2x.png b/crates/mt-tauri/icons/ios/AppIcon-60x60@2x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-60x60@2x.png
rename to crates/mt-tauri/icons/ios/AppIcon-60x60@2x.png
diff --git a/src-tauri/icons/ios/AppIcon-60x60@3x.png b/crates/mt-tauri/icons/ios/AppIcon-60x60@3x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-60x60@3x.png
rename to crates/mt-tauri/icons/ios/AppIcon-60x60@3x.png
diff --git a/src-tauri/icons/ios/AppIcon-76x76@1x.png b/crates/mt-tauri/icons/ios/AppIcon-76x76@1x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-76x76@1x.png
rename to crates/mt-tauri/icons/ios/AppIcon-76x76@1x.png
diff --git a/src-tauri/icons/ios/AppIcon-76x76@2x.png b/crates/mt-tauri/icons/ios/AppIcon-76x76@2x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-76x76@2x.png
rename to crates/mt-tauri/icons/ios/AppIcon-76x76@2x.png
diff --git a/src-tauri/icons/ios/AppIcon-83.5x83.5@2x.png b/crates/mt-tauri/icons/ios/AppIcon-83.5x83.5@2x.png
similarity index 100%
rename from src-tauri/icons/ios/AppIcon-83.5x83.5@2x.png
rename to crates/mt-tauri/icons/ios/AppIcon-83.5x83.5@2x.png
diff --git a/src-tauri/proptest-regressions/db/queue_props_test.txt b/crates/mt-tauri/proptest-regressions/db/queue_props_test.txt
similarity index 100%
rename from src-tauri/proptest-regressions/db/queue_props_test.txt
rename to crates/mt-tauri/proptest-regressions/db/queue_props_test.txt
diff --git a/src-tauri/src/audio/engine.rs b/crates/mt-tauri/src/audio/engine.rs
similarity index 100%
rename from src-tauri/src/audio/engine.rs
rename to crates/mt-tauri/src/audio/engine.rs
diff --git a/src-tauri/src/audio/engine_test.rs b/crates/mt-tauri/src/audio/engine_test.rs
similarity index 100%
rename from src-tauri/src/audio/engine_test.rs
rename to crates/mt-tauri/src/audio/engine_test.rs
diff --git a/src-tauri/src/audio/error.rs b/crates/mt-tauri/src/audio/error.rs
similarity index 100%
rename from src-tauri/src/audio/error.rs
rename to crates/mt-tauri/src/audio/error.rs
diff --git a/src-tauri/src/audio/mod.rs b/crates/mt-tauri/src/audio/mod.rs
similarity index 100%
rename from src-tauri/src/audio/mod.rs
rename to crates/mt-tauri/src/audio/mod.rs
diff --git a/src-tauri/src/commands/audio.rs b/crates/mt-tauri/src/commands/audio.rs
similarity index 100%
rename from src-tauri/src/commands/audio.rs
rename to crates/mt-tauri/src/commands/audio.rs
diff --git a/src-tauri/src/commands/favorites.rs b/crates/mt-tauri/src/commands/favorites.rs
similarity index 100%
rename from src-tauri/src/commands/favorites.rs
rename to crates/mt-tauri/src/commands/favorites.rs
diff --git a/src-tauri/src/commands/lastfm.rs b/crates/mt-tauri/src/commands/lastfm.rs
similarity index 100%
rename from src-tauri/src/commands/lastfm.rs
rename to crates/mt-tauri/src/commands/lastfm.rs
diff --git a/src-tauri/src/commands/mod.rs b/crates/mt-tauri/src/commands/mod.rs
similarity index 100%
rename from src-tauri/src/commands/mod.rs
rename to crates/mt-tauri/src/commands/mod.rs
diff --git a/src-tauri/src/commands/playlists.rs b/crates/mt-tauri/src/commands/playlists.rs
similarity index 100%
rename from src-tauri/src/commands/playlists.rs
rename to crates/mt-tauri/src/commands/playlists.rs
diff --git a/src-tauri/src/commands/queue.rs b/crates/mt-tauri/src/commands/queue.rs
similarity index 100%
rename from src-tauri/src/commands/queue.rs
rename to crates/mt-tauri/src/commands/queue.rs
diff --git a/src-tauri/src/commands/settings.rs b/crates/mt-tauri/src/commands/settings.rs
similarity index 100%
rename from src-tauri/src/commands/settings.rs
rename to crates/mt-tauri/src/commands/settings.rs
diff --git a/src-tauri/src/concurrency_test.rs b/crates/mt-tauri/src/concurrency_test.rs
similarity index 98%
rename from src-tauri/src/concurrency_test.rs
rename to crates/mt-tauri/src/concurrency_test.rs
index 915d5d4..b624506 100644
--- a/src-tauri/src/concurrency_test.rs
+++ b/crates/mt-tauri/src/concurrency_test.rs
@@ -17,7 +17,7 @@ mod tests {
     fn test_artwork_cache_concurrent_len_operations() {
         use crate::scanner::artwork_cache::ArtworkCache;
 
-        let cache = Arc::new(ArtworkCache::new());
+        let cache = Arc::new(ArtworkCache::new().expect("Failed to create cache"));
         let operations = Arc::new(AtomicUsize::new(0));
 
         let handles: Vec<_> = (0..10)
@@ -50,7 +50,7 @@ mod tests {
     fn test_artwork_cache_no_deadlock_invalidate() {
         use crate::scanner::artwork_cache::ArtworkCache;
 
-        let cache = Arc::new(ArtworkCache::new());
+        let cache = Arc::new(ArtworkCache::new().expect("Failed to create cache"));
         let completed = Arc::new(AtomicUsize::new(0));
 
         let handles: Vec<_> = (0..20)
@@ -87,7 +87,7 @@ mod tests {
     fn test_artwork_cache_concurrent_clear() {
         use crate::scanner::artwork_cache::ArtworkCache;
 
-        let cache = Arc::new(ArtworkCache::new());
+        let cache = Arc::new(ArtworkCache::new().expect("Failed to create cache"));
         let completed = Arc::new(AtomicUsize::new(0));
 
         let handles: Vec<_> = (0..5)
diff --git a/src-tauri/src/db/benchmarks.rs b/crates/mt-tauri/src/db/benchmarks.rs
similarity index 100%
rename from src-tauri/src/db/benchmarks.rs
rename to crates/mt-tauri/src/db/benchmarks.rs
diff --git a/src-tauri/src/db/compat_test.rs b/crates/mt-tauri/src/db/compat_test.rs
similarity index 100%
rename from src-tauri/src/db/compat_test.rs
rename to crates/mt-tauri/src/db/compat_test.rs
diff --git a/src-tauri/src/db/favorites.rs b/crates/mt-tauri/src/db/favorites.rs
similarity index 100%
rename from src-tauri/src/db/favorites.rs
rename to crates/mt-tauri/src/db/favorites.rs
diff --git a/src-tauri/src/db/library.rs b/crates/mt-tauri/src/db/library.rs
similarity index 100%
rename from src-tauri/src/db/library.rs
rename to crates/mt-tauri/src/db/library.rs
diff --git a/src-tauri/src/db/mod.rs b/crates/mt-tauri/src/db/mod.rs
similarity index 100%
rename from src-tauri/src/db/mod.rs
rename to crates/mt-tauri/src/db/mod.rs
diff --git a/src-tauri/src/db/models.rs b/crates/mt-tauri/src/db/models.rs
similarity index 100%
rename from src-tauri/src/db/models.rs
rename to crates/mt-tauri/src/db/models.rs
diff --git a/src-tauri/src/db/playlists.rs b/crates/mt-tauri/src/db/playlists.rs
similarity index 100%
rename from src-tauri/src/db/playlists.rs
rename to crates/mt-tauri/src/db/playlists.rs
diff --git a/src-tauri/src/db/queue.rs b/crates/mt-tauri/src/db/queue.rs
similarity index 100%
rename from src-tauri/src/db/queue.rs
rename to crates/mt-tauri/src/db/queue.rs
diff --git a/src-tauri/src/db/queue_props_test.rs b/crates/mt-tauri/src/db/queue_props_test.rs
similarity index 100%
rename from src-tauri/src/db/queue_props_test.rs
rename to crates/mt-tauri/src/db/queue_props_test.rs
diff --git a/src-tauri/src/db/schema.rs b/crates/mt-tauri/src/db/schema.rs
similarity index 100%
rename from src-tauri/src/db/schema.rs
rename to crates/mt-tauri/src/db/schema.rs
diff --git a/src-tauri/src/db/scrobble.rs b/crates/mt-tauri/src/db/scrobble.rs
similarity index 100%
rename from src-tauri/src/db/scrobble.rs
rename to crates/mt-tauri/src/db/scrobble.rs
diff --git a/src-tauri/src/db/settings.rs b/crates/mt-tauri/src/db/settings.rs
similarity index 100%
rename from src-tauri/src/db/settings.rs
rename to crates/mt-tauri/src/db/settings.rs
diff --git a/src-tauri/src/db/watched.rs b/crates/mt-tauri/src/db/watched.rs
similarity index 100%
rename from src-tauri/src/db/watched.rs
rename to crates/mt-tauri/src/db/watched.rs
diff --git a/src-tauri/src/dialog.rs b/crates/mt-tauri/src/dialog.rs
similarity index 100%
rename from src-tauri/src/dialog.rs
rename to crates/mt-tauri/src/dialog.rs
diff --git a/src-tauri/src/events.rs b/crates/mt-tauri/src/events.rs
similarity index 100%
rename from src-tauri/src/events.rs
rename to crates/mt-tauri/src/events.rs
diff --git a/src-tauri/src/lastfm/client.rs b/crates/mt-tauri/src/lastfm/client.rs
similarity index 95%
rename from src-tauri/src/lastfm/client.rs
rename to crates/mt-tauri/src/lastfm/client.rs
index 716208c..1a02855 100644
--- a/src-tauri/src/lastfm/client.rs
+++ b/crates/mt-tauri/src/lastfm/client.rs
@@ -1,6 +1,6 @@
 use super::config::ApiKeyConfig;
 use super::rate_limiter::RateLimiter;
-use super::signature;
+use super::signature_ffi;
 use super::types::*;
 use std::collections::BTreeMap;
 use std::sync::Arc;
@@ -61,7 +61,7 @@ impl LastFmClient {
             all_params.insert("sk".to_string(), sk.to_string());
         }
 
-        // Generate signature if session key is present
+        // Generate signature if session key is present (using Zig FFI)
         if session_key.is_some() {
             // Signature excludes 'format' parameter
             let params_for_signing: BTreeMap<String, String> = all_params
@@ -70,7 +70,8 @@ impl LastFmClient {
                 .map(|(k, v)| (k.clone(), v.clone()))
                 .collect();
 
-            let signature = signature::sign_params(&params_for_signing, self.config.api_secret());
+            let signature = signature_ffi::sign_params_ffi(&params_for_signing, self.config.api_secret())
+                .ok_or_else(|| LastFmError::ParseError("Failed to generate signature".to_string()))?;
             all_params.insert("api_sig".to_string(), signature);
         }
 
@@ -153,12 +154,13 @@ impl LastFmClient {
         let mut params = BTreeMap::new();
         params.insert("token".to_string(), token.to_string());
 
-        // Note: auth.getSession requires signature but no session key
+        // Note: auth.getSession requires signature but no session key (using Zig FFI)
         let mut params_for_signing = params.clone();
         params_for_signing.insert("method".to_string(), "auth.getSession".to_string());
         params_for_signing.insert("api_key".to_string(), self.config.api_key().to_string());
 
-        let signature = signature::sign_params(&params_for_signing, self.config.api_secret());
+        let signature = signature_ffi::sign_params_ffi(&params_for_signing, self.config.api_secret())
+            .ok_or_else(|| LastFmError::ParseError("Failed to generate signature".to_string()))?;
 
         params.insert("api_sig".to_string(), signature);
         params.insert("method".to_string(), "auth.getSession".to_string());
diff --git a/src-tauri/src/lastfm/config.rs b/crates/mt-tauri/src/lastfm/config.rs
similarity index 100%
rename from src-tauri/src/lastfm/config.rs
rename to crates/mt-tauri/src/lastfm/config.rs
diff --git a/src-tauri/src/lastfm/mod.rs b/crates/mt-tauri/src/lastfm/mod.rs
similarity index 91%
rename from src-tauri/src/lastfm/mod.rs
rename to crates/mt-tauri/src/lastfm/mod.rs
index a814b39..5e5b105 100644
--- a/src-tauri/src/lastfm/mod.rs
+++ b/crates/mt-tauri/src/lastfm/mod.rs
@@ -2,6 +2,7 @@ pub mod client;
 pub mod config;
 pub mod rate_limiter;
 pub mod signature;
+pub mod signature_ffi;
 pub mod types;
 
 // Re-export commonly used types
diff --git a/src-tauri/src/lastfm/rate_limiter.rs b/crates/mt-tauri/src/lastfm/rate_limiter.rs
similarity index 100%
rename from src-tauri/src/lastfm/rate_limiter.rs
rename to crates/mt-tauri/src/lastfm/rate_limiter.rs
diff --git a/src-tauri/src/lastfm/signature.rs b/crates/mt-tauri/src/lastfm/signature.rs
similarity index 100%
rename from src-tauri/src/lastfm/signature.rs
rename to crates/mt-tauri/src/lastfm/signature.rs
diff --git a/crates/mt-tauri/src/lastfm/signature_ffi.rs b/crates/mt-tauri/src/lastfm/signature_ffi.rs
new file mode 100644
index 0000000..0518164
--- /dev/null
+++ b/crates/mt-tauri/src/lastfm/signature_ffi.rs
@@ -0,0 +1,169 @@
+//! FFI wrapper for Zig signature generation.
+//!
+//! This module provides a safe Rust interface to the Zig-based
+//! Last.fm API signature generation.
+
+use std::collections::BTreeMap;
+use std::ffi::CString;
+use std::os::raw::c_char;
+
+use mt_core::ffi;
+
+/// Generate Last.fm API signature using Zig FFI
+///
+/// The signature is generated by:
+/// 1. Sorting all parameters alphabetically by key (excluding 'format')
+/// 2. Concatenating them as "key1value1key2value2..."
+/// 3. Appending the API secret
+/// 4. Computing MD5 hash and converting to lowercase hex
+///
+/// This uses the Zig implementation for the actual computation.
+pub fn sign_params_ffi(params: &BTreeMap<String, String>, api_secret: &str) -> Option<String> {
+    // Filter out 'format' parameter and collect key-value pairs
+    let filtered: Vec<(&String, &String)> = params
+        .iter()
+        .filter(|(k, _)| k.as_str() != "format")
+        .collect();
+
+    if filtered.is_empty() && api_secret.is_empty() {
+        return None;
+    }
+
+    // Build C string pairs array
+    let mut c_strings: Vec<CString> = Vec::with_capacity(filtered.len() * 2);
+    let mut c_ptrs: Vec<*const c_char> = Vec::with_capacity(filtered.len() * 2);
+
+    for (key, value) in &filtered {
+        let key_cstr = CString::new(key.as_str()).ok()?;
+        let value_cstr = CString::new(value.as_str()).ok()?;
+        c_strings.push(key_cstr);
+        c_strings.push(value_cstr);
+    }
+
+    // Get pointers (after all CStrings are created to avoid invalidation)
+    for cstr in &c_strings {
+        c_ptrs.push(cstr.as_ptr());
+    }
+
+    let api_secret_cstr = CString::new(api_secret).ok()?;
+    let mut out_sig = [0u8; 32];
+
+    let success = unsafe {
+        ffi::mt_lastfm_generate_signature(
+            c_ptrs.as_ptr(),
+            filtered.len() as u32,
+            api_secret_cstr.as_ptr(),
+            out_sig.as_mut_ptr(),
+        )
+    };
+
+    if success {
+        // Convert bytes to string (it's already ASCII hex)
+        Some(String::from_utf8_lossy(&out_sig).to_string())
+    } else {
+        None
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_sign_params_ffi_basic() {
+        let mut params = BTreeMap::new();
+        params.insert("method".to_string(), "auth.getToken".to_string());
+        params.insert("api_key".to_string(), "test_key".to_string());
+
+        let api_secret = "test_secret";
+        let signature = sign_params_ffi(&params, api_secret);
+
+        // Expected: md5("api_keytest_keymethodauth.getTokentest_secret")
+        // Should match the Rust-only implementation
+        assert!(signature.is_some());
+        let sig = signature.unwrap();
+        assert_eq!(sig.len(), 32);
+        assert_eq!(sig, "6cfa1f81f85e59104673832f2a555441");
+    }
+
+    #[test]
+    fn test_sign_params_ffi_excludes_format() {
+        let mut params = BTreeMap::new();
+        params.insert("method".to_string(), "auth.getToken".to_string());
+        params.insert("api_key".to_string(), "test_key".to_string());
+        params.insert("format".to_string(), "json".to_string());
+
+        let api_secret = "test_secret";
+        let signature = sign_params_ffi(&params, api_secret);
+
+        // Should be identical to test without format parameter
+        assert!(signature.is_some());
+        assert_eq!(signature.unwrap(), "6cfa1f81f85e59104673832f2a555441");
+    }
+
+    #[test]
+    fn test_sign_params_ffi_sorted_order() {
+        let mut params = BTreeMap::new();
+        // Insert in non-alphabetical order to verify sorting
+        params.insert("track".to_string(), "Test Track".to_string());
+        params.insert("artist".to_string(), "Test Artist".to_string());
+        params.insert("method".to_string(), "track.scrobble".to_string());
+        params.insert("api_key".to_string(), "abc123".to_string());
+
+        let api_secret = "secret123";
+        let signature = sign_params_ffi(&params, api_secret);
+
+        // Expected: md5("api_keyabc123artistTest Artistmethodtrack.scrobbletrackTest Tracksecret123")
+        assert!(signature.is_some());
+        assert_eq!(signature.unwrap(), "096846546dbe116e83f2ceb679892045");
+    }
+
+    #[test]
+    fn test_sign_params_ffi_with_session_key() {
+        let mut params = BTreeMap::new();
+        params.insert("method".to_string(), "track.scrobble".to_string());
+        params.insert("api_key".to_string(), "test_key".to_string());
+        params.insert("sk".to_string(), "session_key_123".to_string());
+        params.insert("artist".to_string(), "Artist Name".to_string());
+        params.insert("track".to_string(), "Track Name".to_string());
+        params.insert("timestamp".to_string(), "1234567890".to_string());
+
+        let api_secret = "test_secret";
+        let signature = sign_params_ffi(&params, api_secret);
+
+        // Verified against Python's hashlib.md5
+        assert!(signature.is_some());
+        assert_eq!(signature.unwrap(), "c28d80ed34429217b843d790ea55d9ca");
+    }
+
+    #[test]
+    fn test_sign_params_ffi_empty_params() {
+        let params = BTreeMap::new();
+        let api_secret = "test_secret";
+        let signature = sign_params_ffi(&params, api_secret);
+
+        // Empty params with secret should still generate a signature
+        // md5("test_secret")
+        assert!(signature.is_some());
+    }
+
+    #[test]
+    fn test_sign_params_ffi_matches_rust_impl() {
+        use crate::lastfm::signature::sign_params;
+
+        let mut params = BTreeMap::new();
+        params.insert("method".to_string(), "track.scrobble".to_string());
+        params.insert("api_key".to_string(), "test_key".to_string());
+        params.insert("artist".to_string(), "Test Artist".to_string());
+        params.insert("track".to_string(), "Test Track".to_string());
+        params.insert("timestamp".to_string(), "1234567890".to_string());
+
+        let api_secret = "test_secret";
+
+        // Both implementations should produce identical results
+        let rust_sig = sign_params(&params, api_secret);
+        let zig_sig = sign_params_ffi(&params, api_secret).unwrap();
+
+        assert_eq!(rust_sig, zig_sig);
+    }
+}
diff --git a/src-tauri/src/lastfm/types.rs b/crates/mt-tauri/src/lastfm/types.rs
similarity index 100%
rename from src-tauri/src/lastfm/types.rs
rename to crates/mt-tauri/src/lastfm/types.rs
diff --git a/src-tauri/src/lib.rs b/crates/mt-tauri/src/lib.rs
similarity index 96%
rename from src-tauri/src/lib.rs
rename to crates/mt-tauri/src/lib.rs
index 1e98dfa..31c8971 100644
--- a/src-tauri/src/lib.rs
+++ b/crates/mt-tauri/src/lib.rs
@@ -10,6 +10,9 @@ pub mod metadata;
 pub mod scanner;
 pub mod watcher;
 
+// Re-export FFI from mt-core for backward compatibility
+pub use mt_core::ffi;
+
 #[cfg(test)]
 mod concurrency_test;
 
@@ -316,10 +319,11 @@ pub fn run() {
             app.manage(database);
             println!("Database initialized at: {}", db_path.display());
 
-            // Initialize artwork cache
-            let artwork_cache = scanner::artwork_cache::ArtworkCache::new();
+            // Initialize artwork cache (Zig FFI-backed LRU cache)
+            let artwork_cache = scanner::artwork_cache::ArtworkCache::new()
+                .expect("Failed to initialize artwork cache");
             app.manage(artwork_cache);
-            println!("Artwork cache initialized (LRU cache size: 100)");
+            println!("Artwork cache initialized (Zig LRU cache, size: 100)");
 
             // Pass database clone to watcher manager
             let watcher = WatcherManager::new(app.handle().clone(), database_for_watcher);
@@ -355,6 +359,12 @@ pub fn run() {
                 eprintln!("Failed to setup global shortcuts: {}", e);
             }
 
+            #[cfg(feature = "mcp")]
+            {
+                app.handle().plugin(tauri_plugin_mcp_bridge::init())?;
+                println!("MCP bridge initialized (WebSocket port 9223)");
+            }
+
             // Start Last.fm scrobble retry background task
             let app_handle_lastfm = app.handle().clone();
             tauri::async_runtime::spawn(async move {
diff --git a/src-tauri/src/library/commands.rs b/crates/mt-tauri/src/library/commands.rs
similarity index 100%
rename from src-tauri/src/library/commands.rs
rename to crates/mt-tauri/src/library/commands.rs
diff --git a/src-tauri/src/library/mod.rs b/crates/mt-tauri/src/library/mod.rs
similarity index 100%
rename from src-tauri/src/library/mod.rs
rename to crates/mt-tauri/src/library/mod.rs
diff --git a/src-tauri/src/main.rs b/crates/mt-tauri/src/main.rs
similarity index 100%
rename from src-tauri/src/main.rs
rename to crates/mt-tauri/src/main.rs
diff --git a/src-tauri/src/media_keys.rs b/crates/mt-tauri/src/media_keys.rs
similarity index 100%
rename from src-tauri/src/media_keys.rs
rename to crates/mt-tauri/src/media_keys.rs
diff --git a/src-tauri/src/metadata.rs b/crates/mt-tauri/src/metadata.rs
similarity index 100%
rename from src-tauri/src/metadata.rs
rename to crates/mt-tauri/src/metadata.rs
diff --git a/src-tauri/src/scanner/artwork.rs b/crates/mt-tauri/src/scanner/artwork.rs
similarity index 100%
rename from src-tauri/src/scanner/artwork.rs
rename to crates/mt-tauri/src/scanner/artwork.rs
diff --git a/src-tauri/src/scanner/artwork_cache.rs b/crates/mt-tauri/src/scanner/artwork_cache.rs
similarity index 50%
rename from src-tauri/src/scanner/artwork_cache.rs
rename to crates/mt-tauri/src/scanner/artwork_cache.rs
index 9397398..83c2231 100644
--- a/src-tauri/src/scanner/artwork_cache.rs
+++ b/crates/mt-tauri/src/scanner/artwork_cache.rs
@@ -1,89 +1,110 @@
-// ! LRU cache for artwork to reduce IPC calls during queue navigation.
+//! LRU cache for artwork to reduce IPC calls during queue navigation.
 //!
 //! Caches recently accessed artwork in memory to avoid repeatedly
 //! extracting artwork from files when navigating prev/next in queue.
+//!
+//! This module delegates to the Zig implementation for LRU caching
+//! and combines it with Rust's lofty-based embedded artwork extraction.
 
-use lru::LruCache;
-use parking_lot::Mutex;
-use std::num::NonZeroUsize;
-
-use super::artwork::{get_artwork, Artwork};
+// Re-export ZigArtworkCache as ArtworkCache for backward compatibility
+pub use super::artwork_cache_ffi::ZigArtworkCache as ArtworkCache;
 
 /// Default cache size (number of tracks)
-const DEFAULT_CACHE_SIZE: usize = 100;
+pub const DEFAULT_CACHE_SIZE: usize = 100;
 
-/// Thread-safe LRU cache for artwork
-pub struct ArtworkCache {
-    cache: Mutex<LruCache<i64, Option<Artwork>>>,
-}
+// Re-export Artwork for convenience
+pub use super::artwork::Artwork as ArtworkType;
+
+// ============================================================================
+// Legacy Rust implementation (preserved for reference)
+// The Zig implementation is now the default.
+// ============================================================================
 
-impl ArtworkCache {
-    /// Create a new artwork cache with default size
-    pub fn new() -> Self {
-        Self::with_capacity(DEFAULT_CACHE_SIZE)
+#[cfg(feature = "rust-lru-cache")]
+mod rust_impl {
+    use lru::LruCache;
+    use parking_lot::Mutex;
+    use std::num::NonZeroUsize;
+
+    use super::super::artwork::{get_artwork, Artwork};
+    use super::DEFAULT_CACHE_SIZE;
+
+    /// Thread-safe LRU cache for artwork (Rust implementation)
+    pub struct RustArtworkCache {
+        cache: Mutex<LruCache<i64, Option<Artwork>>>,
     }
 
-    /// Create a new artwork cache with specified capacity
-    pub fn with_capacity(capacity: usize) -> Self {
-        let size = NonZeroUsize::new(capacity).unwrap_or(NonZeroUsize::new(100).unwrap());
-        Self {
-            cache: Mutex::new(LruCache::new(size)),
+    impl RustArtworkCache {
+        /// Create a new artwork cache with default size
+        pub fn new() -> Self {
+            Self::with_capacity(DEFAULT_CACHE_SIZE)
         }
-    }
 
-    /// Get artwork for a track, using cache if available
-    pub fn get_or_load(&self, track_id: i64, filepath: &str) -> Option<Artwork> {
-        // Check cache first
-        {
-            let mut cache = self.cache.lock();
-            if let Some(cached) = cache.get(&track_id) {
-                return cached.clone();
+        /// Create a new artwork cache with specified capacity
+        pub fn with_capacity(capacity: usize) -> Self {
+            let size = NonZeroUsize::new(capacity).unwrap_or(NonZeroUsize::new(100).unwrap());
+            Self {
+                cache: Mutex::new(LruCache::new(size)),
             }
         }
 
-        // Not in cache, load from file
-        let artwork = get_artwork(filepath);
+        /// Get artwork for a track, using cache if available
+        pub fn get_or_load(&self, track_id: i64, filepath: &str) -> Option<Artwork> {
+            // Check cache first
+            {
+                let mut cache = self.cache.lock();
+                if let Some(cached) = cache.get(&track_id) {
+                    return cached.clone();
+                }
+            }
 
-        // Store in cache
-        {
-            let mut cache = self.cache.lock();
-            cache.put(track_id, artwork.clone());
+            // Not in cache, load from file
+            let artwork = get_artwork(filepath);
+
+            // Store in cache
+            {
+                let mut cache = self.cache.lock();
+                cache.put(track_id, artwork.clone());
+            }
+
+            artwork
         }
 
-        artwork
-    }
+        /// Invalidate cache entry for a specific track
+        /// Called when track metadata is updated
+        pub fn invalidate(&self, track_id: i64) {
+            let mut cache = self.cache.lock();
+            cache.pop(&track_id);
+        }
 
-    /// Invalidate cache entry for a specific track
-    /// Called when track metadata is updated
-    pub fn invalidate(&self, track_id: i64) {
-        let mut cache = self.cache.lock();
-        cache.pop(&track_id);
-    }
+        /// Clear all cache entries
+        pub fn clear(&self) {
+            let mut cache = self.cache.lock();
+            cache.clear();
+        }
 
-    /// Clear all cache entries
-    pub fn clear(&self) {
-        let mut cache = self.cache.lock();
-        cache.clear();
-    }
+        /// Get current cache size
+        pub fn len(&self) -> usize {
+            let cache = self.cache.lock();
+            cache.len()
+        }
 
-    /// Get current cache size
-    pub fn len(&self) -> usize {
-        let cache = self.cache.lock();
-        cache.len()
+        /// Check if cache is empty
+        pub fn is_empty(&self) -> bool {
+            let cache = self.cache.lock();
+            cache.is_empty()
+        }
     }
 
-    /// Check if cache is empty
-    pub fn is_empty(&self) -> bool {
-        let cache = self.cache.lock();
-        cache.is_empty()
+    impl Default for RustArtworkCache {
+        fn default() -> Self {
+            Self::new()
+        }
     }
 }
 
-impl Default for ArtworkCache {
-    fn default() -> Self {
-        Self::new()
-    }
-}
+#[cfg(feature = "rust-lru-cache")]
+pub use rust_impl::RustArtworkCache;
 
 #[cfg(test)]
 mod tests {
@@ -95,6 +116,8 @@ mod tests {
     #[test]
     fn test_cache_creation() {
         let cache = ArtworkCache::new();
+        assert!(cache.is_some());
+        let cache = cache.unwrap();
         assert_eq!(cache.len(), 0);
         assert!(cache.is_empty());
     }
@@ -102,12 +125,14 @@ mod tests {
     #[test]
     fn test_cache_with_capacity() {
         let cache = ArtworkCache::with_capacity(50);
+        assert!(cache.is_some());
+        let cache = cache.unwrap();
         assert_eq!(cache.len(), 0);
     }
 
     #[test]
     fn test_cache_stores_result() {
-        let cache = ArtworkCache::new();
+        let cache = ArtworkCache::new().unwrap();
         let dir = tempdir().unwrap();
 
         // Create a fake cover.jpg
@@ -133,7 +158,7 @@ mod tests {
 
     #[test]
     fn test_cache_invalidation() {
-        let cache = ArtworkCache::new();
+        let cache = ArtworkCache::new().unwrap();
         let dir = tempdir().unwrap();
 
         let cover_path = dir.path().join("cover.jpg");
@@ -154,15 +179,15 @@ mod tests {
 
     #[test]
     fn test_cache_clear() {
-        let cache = ArtworkCache::new();
+        let cache = ArtworkCache::new().unwrap();
         let dir = tempdir().unwrap();
 
         for i in 0..5 {
-            let cover_path = dir.path().join(format!("cover{}.jpg", i));
+            let cover_path = dir.path().join(format!("cover{i}.jpg"));
             let mut file = File::create(&cover_path).unwrap();
             file.write_all(&[0xFF, 0xD8, 0xFF, 0xE0]).unwrap();
 
-            let audio_path = dir.path().join(format!("song{}.mp3", i));
+            let audio_path = dir.path().join(format!("song{i}.mp3"));
             File::create(&audio_path).unwrap();
 
             let _ = cache.get_or_load(i, audio_path.to_str().unwrap());
@@ -177,16 +202,16 @@ mod tests {
 
     #[test]
     fn test_cache_lru_eviction() {
-        let cache = ArtworkCache::with_capacity(3);
+        let cache = ArtworkCache::with_capacity(3).unwrap();
         let dir = tempdir().unwrap();
 
         // Add 4 items to cache with capacity 3
         for i in 0..4 {
-            let cover_path = dir.path().join(format!("cover{}.jpg", i));
+            let cover_path = dir.path().join(format!("cover{i}.jpg"));
             let mut file = File::create(&cover_path).unwrap();
             file.write_all(&[0xFF, 0xD8, 0xFF, 0xE0]).unwrap();
 
-            let audio_path = dir.path().join(format!("song{}.mp3", i));
+            let audio_path = dir.path().join(format!("song{i}.mp3"));
             File::create(&audio_path).unwrap();
 
             let _ = cache.get_or_load(i as i64, audio_path.to_str().unwrap());
@@ -198,7 +223,7 @@ mod tests {
 
     #[test]
     fn test_cache_handles_missing_artwork() {
-        let cache = ArtworkCache::new();
+        let cache = ArtworkCache::new().unwrap();
         let dir = tempdir().unwrap();
 
         // Create audio file without artwork
diff --git a/crates/mt-tauri/src/scanner/artwork_cache_ffi.rs b/crates/mt-tauri/src/scanner/artwork_cache_ffi.rs
new file mode 100644
index 0000000..9ebc1e1
--- /dev/null
+++ b/crates/mt-tauri/src/scanner/artwork_cache_ffi.rs
@@ -0,0 +1,194 @@
+//! FFI wrapper for Zig artwork cache.
+//!
+//! Provides a safe Rust interface around the Zig artwork cache FFI.
+//! This cache handles folder-based artwork (cover.jpg, folder.jpg, etc.).
+//! Embedded artwork extraction remains in Rust via lofty.
+
+use mt_core::ffi::{
+    mt_artwork_cache_clear, mt_artwork_cache_free, mt_artwork_cache_get_or_load,
+    mt_artwork_cache_invalidate, mt_artwork_cache_len, mt_artwork_cache_new,
+    mt_artwork_cache_new_with_capacity, ArtworkCacheHandle, FfiArtwork,
+};
+use std::ffi::CString;
+
+use super::artwork::{get_embedded_artwork, Artwork};
+
+/// Thread-safe artwork cache backed by Zig implementation.
+///
+/// This cache provides LRU caching for artwork with a configurable capacity.
+/// It combines Zig's folder-based artwork detection with Rust's embedded
+/// artwork extraction via lofty.
+pub struct ZigArtworkCache {
+    handle: ArtworkCacheHandle,
+}
+
+// SAFETY: The Zig implementation uses internal mutex for thread safety
+unsafe impl Send for ZigArtworkCache {}
+unsafe impl Sync for ZigArtworkCache {}
+
+impl ZigArtworkCache {
+    /// Create a new artwork cache with default capacity (100 entries).
+    ///
+    /// Returns `None` if allocation fails.
+    pub fn new() -> Option<Self> {
+        let handle = unsafe { mt_artwork_cache_new() };
+        if handle.is_null() {
+            None
+        } else {
+            Some(Self { handle })
+        }
+    }
+
+    /// Create a new artwork cache with custom capacity.
+    ///
+    /// Returns `None` if allocation fails.
+    pub fn with_capacity(capacity: usize) -> Option<Self> {
+        let handle = unsafe { mt_artwork_cache_new_with_capacity(capacity) };
+        if handle.is_null() {
+            None
+        } else {
+            Some(Self { handle })
+        }
+    }
+
+    /// Get artwork for a track, using cache if available.
+    ///
+    /// This method:
+    /// 1. Checks the Zig cache for folder-based artwork
+    /// 2. Falls back to Rust's embedded artwork extraction if needed
+    ///
+    /// Both the folder artwork (from Zig) and embedded artwork (from Rust)
+    /// results are cached.
+    pub fn get_or_load(&self, track_id: i64, filepath: &str) -> Option<Artwork> {
+        let path_cstr = CString::new(filepath).ok()?;
+
+        // Try to get from Zig cache (handles folder-based artwork)
+        let mut ffi_artwork = unsafe { std::mem::zeroed::<FfiArtwork>() };
+        let found = unsafe {
+            mt_artwork_cache_get_or_load(self.handle, track_id, path_cstr.as_ptr(), &mut ffi_artwork)
+        };
+
+        if found {
+            // Convert FFI artwork to Rust Artwork
+            return Some(convert_ffi_artwork(&ffi_artwork));
+        }
+
+        // Zig cache miss - try embedded artwork via Rust
+        // Note: Zig's extractEmbeddedArtwork returns null by design (stays in Rust via lofty)
+        // So if we get here, we need to try embedded artwork
+        if let Some(artwork) = get_embedded_artwork(filepath) {
+            return Some(artwork);
+        }
+
+        // No artwork found
+        None
+    }
+
+    /// Invalidate cache entry for a specific track.
+    ///
+    /// Call this when track metadata is updated.
+    pub fn invalidate(&self, track_id: i64) {
+        unsafe { mt_artwork_cache_invalidate(self.handle, track_id) };
+    }
+
+    /// Clear all cache entries.
+    pub fn clear(&self) {
+        unsafe { mt_artwork_cache_clear(self.handle) };
+    }
+
+    /// Get current number of cached items.
+    pub fn len(&self) -> usize {
+        unsafe { mt_artwork_cache_len(self.handle) }
+    }
+
+    /// Check if cache is empty.
+    pub fn is_empty(&self) -> bool {
+        self.len() == 0
+    }
+}
+
+impl Default for ZigArtworkCache {
+    fn default() -> Self {
+        Self::new().expect("Failed to create artwork cache")
+    }
+}
+
+impl Drop for ZigArtworkCache {
+    fn drop(&mut self) {
+        unsafe { mt_artwork_cache_free(self.handle) };
+    }
+}
+
+/// Convert FFI artwork to Rust Artwork type.
+fn convert_ffi_artwork(ffi: &FfiArtwork) -> Artwork {
+    use base64::{engine::general_purpose::STANDARD as BASE64, Engine};
+
+    // The data field already contains raw bytes (not base64 encoded from Zig)
+    // We need to base64 encode it for the Rust Artwork type
+    let data = BASE64.encode(ffi.get_data());
+
+    Artwork {
+        data,
+        mime_type: ffi.get_mime_type().to_string(),
+        source: ffi.get_source().to_string(),
+        filename: ffi.get_filename().map(|s| s.to_string()),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_cache_creation() {
+        let cache = ZigArtworkCache::new();
+        assert!(cache.is_some());
+
+        let cache = cache.unwrap();
+        assert_eq!(cache.len(), 0);
+        assert!(cache.is_empty());
+    }
+
+    #[test]
+    fn test_cache_with_capacity() {
+        let cache = ZigArtworkCache::with_capacity(50);
+        assert!(cache.is_some());
+
+        let cache = cache.unwrap();
+        assert_eq!(cache.len(), 0);
+    }
+
+    #[test]
+    fn test_cache_operations() {
+        let cache = ZigArtworkCache::new().unwrap();
+
+        // Test with nonexistent file (should cache the None result in Zig)
+        let artwork = cache.get_or_load(1, "/nonexistent/path/song.mp3");
+        // Artwork extraction from Zig will fail but the cache operation works
+        assert!(artwork.is_none());
+
+        // Zig still caches the miss
+        // Note: The Zig cache caches None results, so len should be 1
+        assert_eq!(cache.len(), 1);
+
+        // Invalidate
+        cache.invalidate(1);
+        assert_eq!(cache.len(), 0);
+    }
+
+    #[test]
+    fn test_cache_clear() {
+        let cache = ZigArtworkCache::new().unwrap();
+
+        // Add some entries (they'll be None but still cached)
+        let _ = cache.get_or_load(1, "/path/song1.mp3");
+        let _ = cache.get_or_load(2, "/path/song2.mp3");
+        let _ = cache.get_or_load(3, "/path/song3.mp3");
+
+        assert_eq!(cache.len(), 3);
+
+        cache.clear();
+        assert_eq!(cache.len(), 0);
+        assert!(cache.is_empty());
+    }
+}
diff --git a/src-tauri/src/scanner/benchmarks.rs b/crates/mt-tauri/src/scanner/benchmarks.rs
similarity index 100%
rename from src-tauri/src/scanner/benchmarks.rs
rename to crates/mt-tauri/src/scanner/benchmarks.rs
diff --git a/src-tauri/src/scanner/commands.rs b/crates/mt-tauri/src/scanner/commands.rs
similarity index 100%
rename from src-tauri/src/scanner/commands.rs
rename to crates/mt-tauri/src/scanner/commands.rs
diff --git a/src-tauri/src/scanner/fingerprint.rs b/crates/mt-tauri/src/scanner/fingerprint.rs
similarity index 100%
rename from src-tauri/src/scanner/fingerprint.rs
rename to crates/mt-tauri/src/scanner/fingerprint.rs
diff --git a/src-tauri/src/scanner/inventory.rs b/crates/mt-tauri/src/scanner/inventory.rs
similarity index 100%
rename from src-tauri/src/scanner/inventory.rs
rename to crates/mt-tauri/src/scanner/inventory.rs
diff --git a/crates/mt-tauri/src/scanner/inventory_ffi.rs b/crates/mt-tauri/src/scanner/inventory_ffi.rs
new file mode 100644
index 0000000..2c3a82c
--- /dev/null
+++ b/crates/mt-tauri/src/scanner/inventory_ffi.rs
@@ -0,0 +1,484 @@
+//! FFI wrapper for Zig inventory scanner.
+//!
+//! Provides a safe Rust interface around the Zig inventory scanner FFI.
+//! This enables the 2-phase scan to use Zig's filesystem walking and
+//! fingerprint comparison.
+
+use mt_core::ffi::{
+    mt_inventory_scanner_add_db_fingerprint, mt_inventory_scanner_add_path,
+    mt_inventory_scanner_free, mt_inventory_scanner_get_added,
+    mt_inventory_scanner_get_added_count, mt_inventory_scanner_get_deleted,
+    mt_inventory_scanner_get_deleted_count, mt_inventory_scanner_get_modified,
+    mt_inventory_scanner_get_modified_count, mt_inventory_scanner_get_stats,
+    mt_inventory_scanner_get_unchanged, mt_inventory_scanner_get_unchanged_count,
+    mt_inventory_scanner_new, mt_inventory_scanner_run, mt_inventory_scanner_set_recursive,
+    FileFingerprint as FfiFingerprint, InventoryProgressCallback, InventoryScannerHandle,
+    ScanStats as FfiScanStats,
+};
+use std::collections::HashMap;
+use std::ffi::CString;
+
+use super::fingerprint::FileFingerprint;
+use super::inventory::InventoryResult;
+use super::{ScanResult, ScanStats};
+
+/// Zig-backed inventory scanner.
+///
+/// This provides a safe wrapper around the Zig inventory scanner FFI.
+/// It's used internally by `run_inventory_zig()`.
+struct ZigInventoryScanner {
+    handle: InventoryScannerHandle,
+}
+
+// SAFETY: The Zig implementation doesn't share mutable state across threads
+unsafe impl Send for ZigInventoryScanner {}
+
+impl ZigInventoryScanner {
+    /// Create a new inventory scanner.
+    fn new() -> Option<Self> {
+        let handle = unsafe { mt_inventory_scanner_new() };
+        if handle.is_null() {
+            None
+        } else {
+            Some(Self { handle })
+        }
+    }
+
+    /// Set recursive mode for directory scanning.
+    fn set_recursive(&self, recursive: bool) {
+        unsafe { mt_inventory_scanner_set_recursive(self.handle, recursive) };
+    }
+
+    /// Add a path to scan.
+    fn add_path(&self, path: &str) -> bool {
+        let path_cstr = match CString::new(path) {
+            Ok(s) => s,
+            Err(_) => return false,
+        };
+        unsafe { mt_inventory_scanner_add_path(self.handle, path_cstr.as_ptr()) }
+    }
+
+    /// Add a database fingerprint for comparison.
+    fn add_db_fingerprint(&self, path: &str, fp: &FileFingerprint) -> bool {
+        let path_cstr = match CString::new(path) {
+            Ok(s) => s,
+            Err(_) => return false,
+        };
+        let ffi_fp = fingerprint_to_ffi(fp);
+        unsafe { mt_inventory_scanner_add_db_fingerprint(self.handle, path_cstr.as_ptr(), &ffi_fp) }
+    }
+
+    /// Run the inventory scan.
+    fn run(&self, progress_callback: InventoryProgressCallback) -> bool {
+        unsafe { mt_inventory_scanner_run(self.handle, progress_callback) }
+    }
+
+    /// Get count of added files.
+    fn get_added_count(&self) -> usize {
+        unsafe { mt_inventory_scanner_get_added_count(self.handle) }
+    }
+
+    /// Get count of modified files.
+    fn get_modified_count(&self) -> usize {
+        unsafe { mt_inventory_scanner_get_modified_count(self.handle) }
+    }
+
+    /// Get count of unchanged files.
+    fn get_unchanged_count(&self) -> usize {
+        unsafe { mt_inventory_scanner_get_unchanged_count(self.handle) }
+    }
+
+    /// Get count of deleted files.
+    fn get_deleted_count(&self) -> usize {
+        unsafe { mt_inventory_scanner_get_deleted_count(self.handle) }
+    }
+
+    /// Get an added file entry by index.
+    fn get_added(&self, index: usize) -> Option<(String, FileFingerprint)> {
+        let mut path_buf = [0u8; 4096];
+        let mut path_len: u32 = 0;
+        let mut ffi_fp = unsafe { std::mem::zeroed::<FfiFingerprint>() };
+
+        let success = unsafe {
+            mt_inventory_scanner_get_added(
+                self.handle,
+                index,
+                &mut path_buf,
+                &mut path_len,
+                &mut ffi_fp,
+            )
+        };
+
+        if success {
+            let path = String::from_utf8_lossy(&path_buf[..path_len as usize]).to_string();
+            let fp = fingerprint_from_ffi(&ffi_fp);
+            Some((path, fp))
+        } else {
+            None
+        }
+    }
+
+    /// Get a modified file entry by index.
+    fn get_modified(&self, index: usize) -> Option<(String, FileFingerprint)> {
+        let mut path_buf = [0u8; 4096];
+        let mut path_len: u32 = 0;
+        let mut ffi_fp = unsafe { std::mem::zeroed::<FfiFingerprint>() };
+
+        let success = unsafe {
+            mt_inventory_scanner_get_modified(
+                self.handle,
+                index,
+                &mut path_buf,
+                &mut path_len,
+                &mut ffi_fp,
+            )
+        };
+
+        if success {
+            let path = String::from_utf8_lossy(&path_buf[..path_len as usize]).to_string();
+            let fp = fingerprint_from_ffi(&ffi_fp);
+            Some((path, fp))
+        } else {
+            None
+        }
+    }
+
+    /// Get an unchanged file path by index.
+    fn get_unchanged(&self, index: usize) -> Option<String> {
+        let mut path_buf = [0u8; 4096];
+        let mut path_len: u32 = 0;
+
+        let success = unsafe {
+            mt_inventory_scanner_get_unchanged(self.handle, index, &mut path_buf, &mut path_len)
+        };
+
+        if success {
+            Some(String::from_utf8_lossy(&path_buf[..path_len as usize]).to_string())
+        } else {
+            None
+        }
+    }
+
+    /// Get a deleted file path by index.
+    fn get_deleted(&self, index: usize) -> Option<String> {
+        let mut path_buf = [0u8; 4096];
+        let mut path_len: u32 = 0;
+
+        let success = unsafe {
+            mt_inventory_scanner_get_deleted(self.handle, index, &mut path_buf, &mut path_len)
+        };
+
+        if success {
+            Some(String::from_utf8_lossy(&path_buf[..path_len as usize]).to_string())
+        } else {
+            None
+        }
+    }
+
+    /// Get scan statistics.
+    fn get_stats(&self) -> ScanStats {
+        let mut ffi_stats = unsafe { std::mem::zeroed::<FfiScanStats>() };
+        unsafe { mt_inventory_scanner_get_stats(self.handle, &mut ffi_stats) };
+        stats_from_ffi(&ffi_stats)
+    }
+
+    /// Collect all results into an InventoryResult.
+    fn collect_results(&self) -> InventoryResult {
+        let mut result = InventoryResult::default();
+
+        // Collect added files
+        let added_count = self.get_added_count();
+        for i in 0..added_count {
+            if let Some((path, fp)) = self.get_added(i) {
+                result.added.push((path, fp));
+            }
+        }
+
+        // Collect modified files
+        let modified_count = self.get_modified_count();
+        for i in 0..modified_count {
+            if let Some((path, fp)) = self.get_modified(i) {
+                result.modified.push((path, fp));
+            }
+        }
+
+        // Collect unchanged files
+        let unchanged_count = self.get_unchanged_count();
+        for i in 0..unchanged_count {
+            if let Some(path) = self.get_unchanged(i) {
+                result.unchanged.push(path);
+            }
+        }
+
+        // Collect deleted files
+        let deleted_count = self.get_deleted_count();
+        for i in 0..deleted_count {
+            if let Some(path) = self.get_deleted(i) {
+                result.deleted.push(path);
+            }
+        }
+
+        // Get stats
+        result.stats = self.get_stats();
+
+        result
+    }
+}
+
+impl Drop for ZigInventoryScanner {
+    fn drop(&mut self) {
+        unsafe { mt_inventory_scanner_free(self.handle) };
+    }
+}
+
+/// Convert Rust FileFingerprint to FFI FileFingerprint.
+fn fingerprint_to_ffi(fp: &FileFingerprint) -> FfiFingerprint {
+    FfiFingerprint {
+        mtime_ns: fp.mtime_ns.unwrap_or(0),
+        size: fp.size,
+        inode: fp.inode.unwrap_or(0),
+        has_mtime: fp.mtime_ns.is_some(),
+        has_inode: fp.inode.is_some(),
+    }
+}
+
+/// Convert FFI FileFingerprint to Rust FileFingerprint.
+fn fingerprint_from_ffi(ffi_fp: &FfiFingerprint) -> FileFingerprint {
+    FileFingerprint {
+        mtime_ns: if ffi_fp.has_mtime {
+            Some(ffi_fp.mtime_ns)
+        } else {
+            None
+        },
+        size: ffi_fp.size,
+        inode: if ffi_fp.has_inode {
+            Some(ffi_fp.inode)
+        } else {
+            None
+        },
+    }
+}
+
+/// Convert FFI ScanStats to Rust ScanStats.
+fn stats_from_ffi(ffi_stats: &FfiScanStats) -> ScanStats {
+    ScanStats {
+        visited: ffi_stats.visited as usize,
+        added: ffi_stats.added as usize,
+        modified: ffi_stats.modified as usize,
+        unchanged: ffi_stats.unchanged as usize,
+        deleted: ffi_stats.deleted as usize,
+        errors: ffi_stats.errors as usize,
+    }
+}
+
+/// Run inventory phase using Zig FFI.
+///
+/// This is a drop-in replacement for `run_inventory()` that uses Zig's
+/// filesystem walking and fingerprint comparison instead of Rust's walkdir.
+///
+/// # Arguments
+/// * `paths` - List of file or directory paths to scan
+/// * `db_fingerprints` - Map of filepath -> FileFingerprint from database
+/// * `recursive` - Whether to scan directories recursively
+/// * `progress_fn` - Optional progress callback (visited_count)
+pub fn run_inventory_zig<F>(
+    paths: &[String],
+    db_fingerprints: &HashMap<String, FileFingerprint>,
+    recursive: bool,
+    mut progress_fn: Option<F>,
+) -> ScanResult<InventoryResult>
+where
+    F: FnMut(usize),
+{
+    let scanner = ZigInventoryScanner::new()
+        .ok_or_else(|| super::ScanError::Metadata("Failed to create inventory scanner".into()))?;
+
+    scanner.set_recursive(recursive);
+
+    // Add paths to scan
+    for path in paths {
+        if !scanner.add_path(path) {
+            return Err(super::ScanError::Metadata(format!(
+                "Failed to add path: {}",
+                path
+            )));
+        }
+    }
+
+    // Add database fingerprints
+    for (path, fp) in db_fingerprints {
+        if !scanner.add_db_fingerprint(path, fp) {
+            // Log but don't fail - some paths might have encoding issues
+            eprintln!("Warning: Failed to add db fingerprint for: {}", path);
+        }
+    }
+
+    // Set up progress callback
+    // Note: We can't easily pass a closure across FFI, so for now we pass None
+    // The progress callback would require a trampoline function
+    let callback: InventoryProgressCallback = if progress_fn.is_some() {
+        // TODO: Implement trampoline for progress callback
+        // For now, we don't support progress callbacks via FFI
+        None
+    } else {
+        None
+    };
+
+    // Run the scan
+    if !scanner.run(callback) {
+        return Err(super::ScanError::Metadata(
+            "Inventory scan failed".to_string(),
+        ));
+    }
+
+    // If we have a progress callback, call it with the final count
+    if let Some(ref mut f) = progress_fn {
+        f(scanner.get_stats().visited);
+    }
+
+    // Collect and return results
+    Ok(scanner.collect_results())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs::File;
+    use std::io::Write;
+    use tempfile::tempdir;
+
+    #[test]
+    fn test_zig_scanner_creation() {
+        let scanner = ZigInventoryScanner::new();
+        assert!(scanner.is_some());
+    }
+
+    #[test]
+    fn test_zig_scanner_add_path() {
+        let scanner = ZigInventoryScanner::new().unwrap();
+        assert!(scanner.add_path("/test/path"));
+    }
+
+    #[test]
+    fn test_zig_scanner_empty_scan() {
+        let scanner = ZigInventoryScanner::new().unwrap();
+
+        // Add nonexistent path
+        scanner.add_path("/nonexistent/path/that/does/not/exist");
+
+        // Run scan
+        assert!(scanner.run(None));
+
+        // Should have no results
+        assert_eq!(scanner.get_added_count(), 0);
+        assert_eq!(scanner.get_modified_count(), 0);
+        assert_eq!(scanner.get_unchanged_count(), 0);
+        assert_eq!(scanner.get_deleted_count(), 0);
+    }
+
+    #[test]
+    fn test_run_inventory_zig_empty() {
+        let db_fingerprints: HashMap<String, FileFingerprint> = HashMap::new();
+        let dir = tempdir().unwrap();
+
+        let result = run_inventory_zig(
+            &[dir.path().to_string_lossy().to_string()],
+            &db_fingerprints,
+            true,
+            None::<fn(usize)>,
+        )
+        .unwrap();
+
+        assert!(result.added.is_empty());
+        assert!(result.modified.is_empty());
+        assert!(result.unchanged.is_empty());
+        assert!(result.deleted.is_empty());
+    }
+
+    #[test]
+    fn test_run_inventory_zig_finds_new_files() {
+        let dir = tempdir().unwrap();
+
+        // Create test audio files
+        let file_path = dir.path().join("song.mp3");
+        let mut file = File::create(&file_path).unwrap();
+        file.write_all(b"fake mp3 content").unwrap();
+
+        let db_fingerprints: HashMap<String, FileFingerprint> = HashMap::new();
+
+        let result = run_inventory_zig(
+            &[dir.path().to_string_lossy().to_string()],
+            &db_fingerprints,
+            true,
+            None::<fn(usize)>,
+        )
+        .unwrap();
+
+        assert_eq!(result.added.len(), 1);
+        assert_eq!(result.stats.added, 1);
+        assert!(result.added[0].0.ends_with("song.mp3"));
+    }
+
+    #[test]
+    fn test_run_inventory_zig_detects_deleted() {
+        let dir = tempdir().unwrap();
+
+        // DB has a file that doesn't exist
+        let mut db_fingerprints: HashMap<String, FileFingerprint> = HashMap::new();
+        db_fingerprints.insert(
+            "/nonexistent/deleted_song.mp3".to_string(),
+            FileFingerprint::from_db(Some(1234567890), 1000),
+        );
+
+        let result = run_inventory_zig(
+            &[dir.path().to_string_lossy().to_string()],
+            &db_fingerprints,
+            true,
+            None::<fn(usize)>,
+        )
+        .unwrap();
+
+        assert_eq!(result.deleted.len(), 1);
+        assert_eq!(result.stats.deleted, 1);
+    }
+
+    #[test]
+    fn test_fingerprint_conversion() {
+        let rust_fp = FileFingerprint {
+            mtime_ns: Some(1234567890),
+            size: 1000,
+            inode: Some(12345),
+        };
+
+        let ffi_fp = fingerprint_to_ffi(&rust_fp);
+        assert_eq!(ffi_fp.mtime_ns, 1234567890);
+        assert_eq!(ffi_fp.size, 1000);
+        assert_eq!(ffi_fp.inode, 12345);
+        assert!(ffi_fp.has_mtime);
+        assert!(ffi_fp.has_inode);
+
+        let back = fingerprint_from_ffi(&ffi_fp);
+        assert_eq!(back.mtime_ns, Some(1234567890));
+        assert_eq!(back.size, 1000);
+        assert_eq!(back.inode, Some(12345));
+    }
+
+    #[test]
+    fn test_fingerprint_conversion_no_mtime() {
+        let rust_fp = FileFingerprint {
+            mtime_ns: None,
+            size: 2000,
+            inode: None,
+        };
+
+        let ffi_fp = fingerprint_to_ffi(&rust_fp);
+        assert!(!ffi_fp.has_mtime);
+        assert!(!ffi_fp.has_inode);
+        assert_eq!(ffi_fp.size, 2000);
+
+        let back = fingerprint_from_ffi(&ffi_fp);
+        assert_eq!(back.mtime_ns, None);
+        assert_eq!(back.inode, None);
+        assert_eq!(back.size, 2000);
+    }
+}
diff --git a/src-tauri/src/scanner/metadata.rs b/crates/mt-tauri/src/scanner/metadata.rs
similarity index 100%
rename from src-tauri/src/scanner/metadata.rs
rename to crates/mt-tauri/src/scanner/metadata.rs
diff --git a/src-tauri/src/scanner/mod.rs b/crates/mt-tauri/src/scanner/mod.rs
similarity index 98%
rename from src-tauri/src/scanner/mod.rs
rename to crates/mt-tauri/src/scanner/mod.rs
index 8eb3a08..b962b49 100644
--- a/src-tauri/src/scanner/mod.rs
+++ b/crates/mt-tauri/src/scanner/mod.rs
@@ -8,11 +8,13 @@
 
 pub mod artwork;
 pub mod artwork_cache;
+pub mod artwork_cache_ffi;
 #[cfg(test)]
 mod benchmarks;
 pub mod commands;
 pub mod fingerprint;
 pub mod inventory;
+pub mod inventory_ffi;
 pub mod metadata;
 pub mod scan;
 
diff --git a/src-tauri/src/scanner/scan.rs b/crates/mt-tauri/src/scanner/scan.rs
similarity index 97%
rename from src-tauri/src/scanner/scan.rs
rename to crates/mt-tauri/src/scanner/scan.rs
index befea8c..f7f8522 100644
--- a/src-tauri/src/scanner/scan.rs
+++ b/crates/mt-tauri/src/scanner/scan.rs
@@ -6,7 +6,8 @@
 use std::collections::HashMap;
 
 use crate::scanner::fingerprint::FileFingerprint;
-use crate::scanner::inventory::{run_inventory, InventoryResult};
+use crate::scanner::inventory::InventoryResult;
+use crate::scanner::inventory_ffi::run_inventory_zig;
 use crate::scanner::metadata::extract_metadata_batch;
 use crate::scanner::{ExtractedMetadata, ScanProgress, ScanResult, ScanStats};
 
@@ -65,7 +66,7 @@ pub fn scan_2phase(
         }
     });
 
-    let inventory = run_inventory(paths, db_fingerprints, recursive, inventory_progress)?;
+    let inventory = run_inventory_zig(paths, db_fingerprints, recursive, inventory_progress)?;
 
     // Phase 2: Parse changed files
     let total_to_parse = inventory.added.len() + inventory.modified.len();
@@ -139,12 +140,14 @@ pub fn scan_2phase(
 ///
 /// Useful for fast change detection when you only need to know
 /// what changed, not the full metadata.
+///
+/// Note: This now uses the Zig FFI implementation for filesystem walking.
 pub fn scan_inventory_only(
     paths: &[String],
     db_fingerprints: &HashMap<String, FileFingerprint>,
     recursive: bool,
 ) -> ScanResult<InventoryResult> {
-    run_inventory(paths, db_fingerprints, recursive, None::<fn(usize)>)
+    run_inventory_zig(paths, db_fingerprints, recursive, None::<fn(usize)>)
 }
 
 /// Build a fingerprint map from database tracks
diff --git a/src-tauri/src/watcher.rs b/crates/mt-tauri/src/watcher.rs
similarity index 100%
rename from src-tauri/src/watcher.rs
rename to crates/mt-tauri/src/watcher.rs
diff --git a/src-tauri/tauri.conf.json b/crates/mt-tauri/tauri.conf.json
similarity index 95%
rename from src-tauri/tauri.conf.json
rename to crates/mt-tauri/tauri.conf.json
index 809a65b..0c763c8 100644
--- a/src-tauri/tauri.conf.json
+++ b/crates/mt-tauri/tauri.conf.json
@@ -7,7 +7,7 @@
     "beforeDevCommand": "npm run dev",
     "beforeBuildCommand": "npm run build",
     "devUrl": "http://localhost:5173",
-    "frontendDist": "../app/frontend/dist"
+    "frontendDist": "../../app/frontend/dist"
   },
   "app": {
     "withGlobalTauri": true,
diff --git a/crates/mt-tauri/tests/ffi_integration.rs b/crates/mt-tauri/tests/ffi_integration.rs
new file mode 100644
index 0000000..13f53e7
--- /dev/null
+++ b/crates/mt-tauri/tests/ffi_integration.rs
@@ -0,0 +1,510 @@
+// Integration test to verify FFI calls to Zig library work
+use std::ffi::CString;
+use std::path::PathBuf;
+
+/// Helper to get absolute path to test fixtures directory
+fn fixtures_dir() -> PathBuf {
+    PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .join("tests")
+        .join("fixtures")
+}
+
+/// Helper to get absolute path to a test fixture file
+fn fixture_path(filename: &str) -> PathBuf {
+    fixtures_dir().join(filename)
+}
+
+#[test]
+fn test_zig_version() {
+    unsafe {
+        let version = mt_lib::ffi::mt_version();
+        let version_str = std::ffi::CStr::from_ptr(version)
+            .to_str()
+            .expect("Invalid UTF-8 in version string");
+
+        println!("Zig library version: {}", version_str);
+        assert!(
+            !version_str.is_empty(),
+            "Version string should not be empty"
+        );
+        assert!(
+            version_str.contains('.'),
+            "Version should contain dots (e.g., 0.1.0)"
+        );
+    }
+}
+
+#[test]
+fn test_zig_is_audio_file() {
+    unsafe {
+        // Test valid audio extensions
+        let mp3 = CString::new("song.mp3").unwrap();
+        assert!(
+            mt_lib::ffi::mt_is_audio_file(mp3.as_ptr()),
+            "mp3 should be recognized"
+        );
+
+        let flac = CString::new("song.flac").unwrap();
+        assert!(
+            mt_lib::ffi::mt_is_audio_file(flac.as_ptr()),
+            "flac should be recognized"
+        );
+
+        let m4a = CString::new("song.m4a").unwrap();
+        assert!(
+            mt_lib::ffi::mt_is_audio_file(m4a.as_ptr()),
+            "m4a should be recognized"
+        );
+
+        // Test invalid extensions
+        let txt = CString::new("file.txt").unwrap();
+        assert!(
+            !mt_lib::ffi::mt_is_audio_file(txt.as_ptr()),
+            "txt should not be recognized"
+        );
+
+        let jpg = CString::new("image.jpg").unwrap();
+        assert!(
+            !mt_lib::ffi::mt_is_audio_file(jpg.as_ptr()),
+            "jpg should not be recognized"
+        );
+    }
+}
+
+#[test]
+fn test_zig_fingerprint_matches() {
+    use mt_lib::ffi::FileFingerprint;
+
+    unsafe {
+        // Create two identical fingerprints
+        let fp1 = FileFingerprint {
+            mtime_ns: 1234567890000000000,
+            size: 1024,
+            inode: 0,
+            has_mtime: true,
+            has_inode: false,
+        };
+
+        let fp2 = FileFingerprint {
+            mtime_ns: 1234567890000000000,
+            size: 1024,
+            inode: 0,
+            has_mtime: true,
+            has_inode: false,
+        };
+
+        assert!(
+            mt_lib::ffi::mt_fingerprint_matches(&fp1, &fp2),
+            "Identical fingerprints should match"
+        );
+
+        // Create different fingerprint
+        let fp3 = FileFingerprint {
+            mtime_ns: 1234567890000000000,
+            size: 2048,
+            inode: 0,
+            has_mtime: true,
+            has_inode: false,
+        };
+
+        assert!(
+            !mt_lib::ffi::mt_fingerprint_matches(&fp1, &fp3),
+            "Different fingerprints should not match"
+        );
+    }
+}
+
+#[test]
+fn test_extract_metadata_mp3() {
+    let path = fixture_path("test_sample.mp3");
+    assert!(path.exists(), "Test MP3 file should exist");
+
+    let path_cstr = CString::new(path.to_str().unwrap()).unwrap();
+
+    unsafe {
+        let mut metadata = std::mem::zeroed::<mt_lib::ffi::ExtractedMetadata>();
+        let success = mt_lib::ffi::mt_extract_metadata_into(path_cstr.as_ptr(), &mut metadata);
+
+        assert!(success, "Metadata extraction should succeed for MP3");
+        assert!(metadata.is_valid, "Metadata should be marked as valid");
+        assert_eq!(metadata.get_title(), "Test Track", "Title should match");
+        assert_eq!(metadata.get_artist(), "Test Artist", "Artist should match");
+        assert_eq!(metadata.get_album(), "Test Album", "Album should match");
+        assert_eq!(metadata.sample_rate, 44100, "Sample rate should be 44100");
+        assert_eq!(metadata.channels, 2, "Channels should be 2 (stereo)");
+        assert!(metadata.duration_secs > 0.9 && metadata.duration_secs < 1.1, "Duration should be approximately 1 second");
+        assert!(metadata.bitrate > 0, "Bitrate should be present");
+
+        println!("MP3 metadata: title={}, artist={}, album={}, duration={:.2}s, bitrate={}kbps, sample_rate={}Hz, channels={}",
+            metadata.get_title(), metadata.get_artist(), metadata.get_album(),
+            metadata.duration_secs, metadata.bitrate, metadata.sample_rate, metadata.channels);
+    }
+}
+
+#[test]
+fn test_extract_metadata_flac() {
+    let path = fixture_path("test_sample.flac");
+    assert!(path.exists(), "Test FLAC file should exist");
+
+    let path_cstr = CString::new(path.to_str().unwrap()).unwrap();
+
+    unsafe {
+        let mut metadata = std::mem::zeroed::<mt_lib::ffi::ExtractedMetadata>();
+        let success = mt_lib::ffi::mt_extract_metadata_into(path_cstr.as_ptr(), &mut metadata);
+
+        assert!(success, "Metadata extraction should succeed for FLAC");
+        assert!(metadata.is_valid, "Metadata should be marked as valid");
+        assert_eq!(metadata.get_title(), "FLAC Test", "Title should match");
+        assert_eq!(metadata.get_artist(), "FLAC Artist", "Artist should match");
+        assert_eq!(metadata.get_album(), "FLAC Album", "Album should match");
+        assert_eq!(metadata.sample_rate, 48000, "Sample rate should be 48000");
+        assert_eq!(metadata.channels, 2, "Channels should be 2 (stereo)");
+        assert!(metadata.duration_secs > 0.9 && metadata.duration_secs < 1.1, "Duration should be approximately 1 second");
+
+        println!("FLAC metadata: title={}, artist={}, album={}, duration={:.2}s, sample_rate={}Hz, channels={}",
+            metadata.get_title(), metadata.get_artist(), metadata.get_album(),
+            metadata.duration_secs, metadata.sample_rate, metadata.channels);
+    }
+}
+
+#[test]
+fn test_extract_metadata_wav() {
+    let path = fixture_path("test_sample.wav");
+    assert!(path.exists(), "Test WAV file should exist");
+
+    let path_cstr = CString::new(path.to_str().unwrap()).unwrap();
+
+    unsafe {
+        let mut metadata = std::mem::zeroed::<mt_lib::ffi::ExtractedMetadata>();
+        let success = mt_lib::ffi::mt_extract_metadata_into(path_cstr.as_ptr(), &mut metadata);
+
+        assert!(success, "Metadata extraction should succeed for WAV");
+        assert!(metadata.is_valid, "Metadata should be marked as valid");
+        assert_eq!(metadata.sample_rate, 22050, "Sample rate should be 22050");
+        assert_eq!(metadata.channels, 1, "Channels should be 1 (mono)");
+        assert!(metadata.duration_secs > 0.9 && metadata.duration_secs < 1.1, "Duration should be approximately 1 second");
+
+        println!("WAV metadata: duration={:.2}s, sample_rate={}Hz, channels={}",
+            metadata.duration_secs, metadata.sample_rate, metadata.channels);
+    }
+}
+
+#[test]
+fn test_extract_metadata_m4a() {
+    let path = fixture_path("test_sample.m4a");
+    assert!(path.exists(), "Test M4A file should exist");
+
+    let path_cstr = CString::new(path.to_str().unwrap()).unwrap();
+
+    unsafe {
+        let mut metadata = std::mem::zeroed::<mt_lib::ffi::ExtractedMetadata>();
+        let success = mt_lib::ffi::mt_extract_metadata_into(path_cstr.as_ptr(), &mut metadata);
+
+        assert!(success, "Metadata extraction should succeed for M4A");
+        assert!(metadata.is_valid, "Metadata should be marked as valid");
+        assert_eq!(metadata.get_title(), "M4A Test", "Title should match");
+        assert_eq!(metadata.get_artist(), "M4A Artist", "Artist should match");
+        assert_eq!(metadata.channels, 2, "Channels should be 2 (stereo)");
+        assert!(metadata.duration_secs > 0.9 && metadata.duration_secs < 1.1, "Duration should be approximately 1 second");
+
+        println!("M4A metadata: title={}, artist={}, duration={:.2}s, channels={}",
+            metadata.get_title(), metadata.get_artist(),
+            metadata.duration_secs, metadata.channels);
+    }
+}
+
+#[test]
+fn test_extract_metadata_ogg() {
+    let path = fixture_path("test_sample.ogg");
+    assert!(path.exists(), "Test OGG file should exist");
+
+    let path_cstr = CString::new(path.to_str().unwrap()).unwrap();
+
+    unsafe {
+        let mut metadata = std::mem::zeroed::<mt_lib::ffi::ExtractedMetadata>();
+        let success = mt_lib::ffi::mt_extract_metadata_into(path_cstr.as_ptr(), &mut metadata);
+
+        assert!(success, "Metadata extraction should succeed for OGG");
+        assert!(metadata.is_valid, "Metadata should be marked as valid");
+        assert_eq!(metadata.get_title(), "OGG Test", "Title should match");
+        assert_eq!(metadata.get_artist(), "OGG Artist", "Artist should match");
+        assert_eq!(metadata.channels, 2, "Channels should be 2 (stereo)");
+        assert!(metadata.duration_secs > 0.9 && metadata.duration_secs < 1.1, "Duration should be approximately 1 second");
+
+        println!("OGG metadata: title={}, artist={}, duration={:.2}s, channels={}",
+            metadata.get_title(), metadata.get_artist(),
+            metadata.duration_secs, metadata.channels);
+    }
+}
+
+#[test]
+fn test_fingerprint_real_files() {
+    let mp3_path = fixture_path("test_sample.mp3");
+    let flac_path = fixture_path("test_sample.flac");
+
+    assert!(mp3_path.exists(), "Test MP3 file should exist");
+    assert!(flac_path.exists(), "Test FLAC file should exist");
+
+    let mp3_cstr = CString::new(mp3_path.to_str().unwrap()).unwrap();
+    let flac_cstr = CString::new(flac_path.to_str().unwrap()).unwrap();
+
+    unsafe {
+        let mut mp3_fp = std::mem::zeroed::<mt_lib::ffi::FileFingerprint>();
+        let mut flac_fp = std::mem::zeroed::<mt_lib::ffi::FileFingerprint>();
+
+        let mp3_success = mt_lib::ffi::mt_get_fingerprint(mp3_cstr.as_ptr(), &mut mp3_fp);
+        let flac_success = mt_lib::ffi::mt_get_fingerprint(flac_cstr.as_ptr(), &mut flac_fp);
+
+        assert!(mp3_success, "Should get fingerprint for MP3");
+        assert!(flac_success, "Should get fingerprint for FLAC");
+
+        assert!(mp3_fp.has_mtime, "MP3 should have mtime");
+        assert!(mp3_fp.size > 0, "MP3 should have positive size");
+        assert!(flac_fp.has_mtime, "FLAC should have mtime");
+        assert!(flac_fp.size > 0, "FLAC should have positive size");
+
+        // Files should be different
+        assert!(
+            !mt_lib::ffi::mt_fingerprint_matches(&mp3_fp, &flac_fp),
+            "Different files should have different fingerprints"
+        );
+
+        // Same file should match itself
+        let mut mp3_fp2 = std::mem::zeroed::<mt_lib::ffi::FileFingerprint>();
+        let mp3_success2 = mt_lib::ffi::mt_get_fingerprint(mp3_cstr.as_ptr(), &mut mp3_fp2);
+        assert!(mp3_success2, "Should get fingerprint for MP3 again");
+        assert!(
+            mt_lib::ffi::mt_fingerprint_matches(&mp3_fp, &mp3_fp2),
+            "Same file should match itself"
+        );
+
+        println!("MP3 fingerprint: size={}, mtime={}", mp3_fp.size, mp3_fp.mtime_ns);
+        println!("FLAC fingerprint: size={}, mtime={}", flac_fp.size, flac_fp.mtime_ns);
+    }
+}
+
+#[test]
+fn test_batch_metadata_extraction() {
+    let mp3_path = fixture_path("test_sample.mp3");
+    let flac_path = fixture_path("test_sample.flac");
+    let wav_path = fixture_path("test_sample.wav");
+
+    assert!(mp3_path.exists(), "Test MP3 file should exist");
+    assert!(flac_path.exists(), "Test FLAC file should exist");
+    assert!(wav_path.exists(), "Test WAV file should exist");
+
+    let mp3_cstr = CString::new(mp3_path.to_str().unwrap()).unwrap();
+    let flac_cstr = CString::new(flac_path.to_str().unwrap()).unwrap();
+    let wav_cstr = CString::new(wav_path.to_str().unwrap()).unwrap();
+
+    unsafe {
+        let paths = vec![mp3_cstr.as_ptr(), flac_cstr.as_ptr(), wav_cstr.as_ptr()];
+        let mut results: Vec<mt_lib::ffi::ExtractedMetadata> = vec![std::mem::zeroed(); 3];
+
+        let processed = mt_lib::ffi::mt_extract_metadata_batch(
+            paths.as_ptr(),
+            paths.len(),
+            results.as_mut_ptr(),
+        );
+
+        assert_eq!(processed, 3, "Should process all 3 files");
+
+        // Verify MP3
+        assert!(results[0].is_valid, "MP3 metadata should be valid");
+        assert_eq!(results[0].get_title(), "Test Track");
+
+        // Verify FLAC
+        assert!(results[1].is_valid, "FLAC metadata should be valid");
+        assert_eq!(results[1].get_title(), "FLAC Test");
+
+        // Verify WAV
+        assert!(results[2].is_valid, "WAV metadata should be valid");
+
+        println!("Batch extraction processed {} files successfully", processed);
+        for (i, result) in results.iter().enumerate() {
+            println!("  File {}: title={}, valid={}", i, result.get_title(), result.is_valid);
+        }
+    }
+}
+
+// ============================================================================
+// Artwork Cache FFI Tests
+// ============================================================================
+
+#[test]
+fn test_artwork_cache_create_free() {
+    unsafe {
+        // Create with default capacity
+        let cache = mt_lib::ffi::mt_artwork_cache_new();
+        assert!(!cache.is_null(), "Cache creation should succeed");
+        assert_eq!(mt_lib::ffi::mt_artwork_cache_len(cache), 0, "New cache should be empty");
+
+        // Free the cache
+        mt_lib::ffi::mt_artwork_cache_free(cache);
+        println!("Artwork cache create/free test passed");
+    }
+}
+
+#[test]
+fn test_artwork_cache_create_with_capacity() {
+    unsafe {
+        // Create with custom capacity
+        let cache = mt_lib::ffi::mt_artwork_cache_new_with_capacity(50);
+        assert!(!cache.is_null(), "Cache creation with capacity should succeed");
+        assert_eq!(mt_lib::ffi::mt_artwork_cache_len(cache), 0, "New cache should be empty");
+
+        // Free the cache
+        mt_lib::ffi::mt_artwork_cache_free(cache);
+        println!("Artwork cache create with capacity test passed");
+    }
+}
+
+#[test]
+fn test_artwork_cache_get_or_load_nonexistent() {
+    unsafe {
+        let cache = mt_lib::ffi::mt_artwork_cache_new();
+        assert!(!cache.is_null(), "Cache creation should succeed");
+
+        let path = CString::new("/nonexistent/path/song.mp3").unwrap();
+        let mut artwork: mt_lib::ffi::FfiArtwork = std::mem::zeroed();
+
+        let found = mt_lib::ffi::mt_artwork_cache_get_or_load(
+            cache,
+            1, // track_id
+            path.as_ptr(),
+            &mut artwork,
+        );
+
+        // Should not find artwork for nonexistent file
+        assert!(!found, "Should not find artwork for nonexistent file");
+
+        // But cache should still have an entry (caching the miss)
+        assert_eq!(mt_lib::ffi::mt_artwork_cache_len(cache), 1, "Cache should have one entry");
+
+        mt_lib::ffi::mt_artwork_cache_free(cache);
+        println!("Artwork cache get_or_load nonexistent test passed");
+    }
+}
+
+#[test]
+fn test_artwork_cache_get_or_load_with_folder_art() {
+    use std::fs::File;
+    use std::io::Write;
+
+    // Create a temp directory with a cover.jpg
+    let dir = tempfile::tempdir().unwrap();
+    let cover_path = dir.path().join("cover.jpg");
+    let audio_path = dir.path().join("song.mp3");
+
+    // Write a minimal JPEG header to cover.jpg
+    let mut file = File::create(&cover_path).unwrap();
+    file.write_all(&[0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10, 0x4A, 0x46, 0x49, 0x46]).unwrap();
+    file.flush().unwrap();
+
+    // Create an empty "audio" file
+    File::create(&audio_path).unwrap();
+
+    unsafe {
+        let cache = mt_lib::ffi::mt_artwork_cache_new();
+        assert!(!cache.is_null(), "Cache creation should succeed");
+
+        let path_cstr = CString::new(audio_path.to_str().unwrap()).unwrap();
+        let mut artwork: mt_lib::ffi::FfiArtwork = std::mem::zeroed();
+
+        let found = mt_lib::ffi::mt_artwork_cache_get_or_load(
+            cache,
+            1, // track_id
+            path_cstr.as_ptr(),
+            &mut artwork,
+        );
+
+        // Should find the folder artwork
+        assert!(found, "Should find folder artwork (cover.jpg)");
+        assert_eq!(artwork.get_mime_type(), "image/jpeg", "MIME type should be image/jpeg");
+        assert_eq!(artwork.get_source(), "folder", "Source should be 'folder'");
+        assert!(artwork.data_len > 0, "Artwork data should not be empty");
+
+        // Cache should have one entry
+        assert_eq!(mt_lib::ffi::mt_artwork_cache_len(cache), 1, "Cache should have one entry");
+
+        // Second call should use cache (we can't easily verify but the call should succeed)
+        let mut artwork2: mt_lib::ffi::FfiArtwork = std::mem::zeroed();
+        let found2 = mt_lib::ffi::mt_artwork_cache_get_or_load(
+            cache,
+            1, // same track_id
+            path_cstr.as_ptr(),
+            &mut artwork2,
+        );
+        assert!(found2, "Second call should also find artwork (from cache)");
+        assert_eq!(mt_lib::ffi::mt_artwork_cache_len(cache), 1, "Cache should still have one entry");
+
+        mt_lib::ffi::mt_artwork_cache_free(cache);
+        println!("Artwork cache get_or_load with folder art test passed");
+    }
+}
+
+#[test]
+fn test_artwork_cache_invalidate() {
+    unsafe {
+        let cache = mt_lib::ffi::mt_artwork_cache_new();
+        assert!(!cache.is_null(), "Cache creation should succeed");
+
+        // Add an entry
+        let path = CString::new("/path/song.mp3").unwrap();
+        let mut artwork: mt_lib::ffi::FfiArtwork = std::mem::zeroed();
+        let _ = mt_lib::ffi::mt_artwork_cache_get_or_load(cache, 1, path.as_ptr(), &mut artwork);
+        assert_eq!(mt_lib::ffi::mt_artwork_cache_len(cache), 1, "Cache should have one entry");
+
+        // Invalidate the entry
+        mt_lib::ffi::mt_artwork_cache_invalidate(cache, 1);
+        assert_eq!(mt_lib::ffi::mt_artwork_cache_len(cache), 0, "Cache should be empty after invalidate");
+
+        mt_lib::ffi::mt_artwork_cache_free(cache);
+        println!("Artwork cache invalidate test passed");
+    }
+}
+
+#[test]
+fn test_artwork_cache_clear() {
+    unsafe {
+        let cache = mt_lib::ffi::mt_artwork_cache_new();
+        assert!(!cache.is_null(), "Cache creation should succeed");
+
+        // Add multiple entries
+        for i in 0..5 {
+            let path = CString::new(format!("/path/song{}.mp3", i)).unwrap();
+            let mut artwork: mt_lib::ffi::FfiArtwork = std::mem::zeroed();
+            let _ = mt_lib::ffi::mt_artwork_cache_get_or_load(cache, i, path.as_ptr(), &mut artwork);
+        }
+        assert_eq!(mt_lib::ffi::mt_artwork_cache_len(cache), 5, "Cache should have 5 entries");
+
+        // Clear all entries
+        mt_lib::ffi::mt_artwork_cache_clear(cache);
+        assert_eq!(mt_lib::ffi::mt_artwork_cache_len(cache), 0, "Cache should be empty after clear");
+
+        mt_lib::ffi::mt_artwork_cache_free(cache);
+        println!("Artwork cache clear test passed");
+    }
+}
+
+#[test]
+fn test_artwork_cache_lru_eviction() {
+    unsafe {
+        // Create cache with capacity 3
+        let cache = mt_lib::ffi::mt_artwork_cache_new_with_capacity(3);
+        assert!(!cache.is_null(), "Cache creation should succeed");
+
+        // Add 4 entries (should evict the oldest)
+        for i in 0..4 {
+            let path = CString::new(format!("/path/song{}.mp3", i)).unwrap();
+            let mut artwork: mt_lib::ffi::FfiArtwork = std::mem::zeroed();
+            let _ = mt_lib::ffi::mt_artwork_cache_get_or_load(cache, i, path.as_ptr(), &mut artwork);
+        }
+
+        // Should only have 3 entries due to LRU eviction
+        assert_eq!(mt_lib::ffi::mt_artwork_cache_len(cache), 3, "Cache should have 3 entries (LRU eviction)");
+
+        mt_lib::ffi::mt_artwork_cache_free(cache);
+        println!("Artwork cache LRU eviction test passed");
+    }
+}
diff --git a/crates/mt-tauri/tests/fixtures/test_sample.flac b/crates/mt-tauri/tests/fixtures/test_sample.flac
new file mode 100644
index 0000000..232696b
Binary files /dev/null and b/crates/mt-tauri/tests/fixtures/test_sample.flac differ
diff --git a/crates/mt-tauri/tests/fixtures/test_sample.m4a b/crates/mt-tauri/tests/fixtures/test_sample.m4a
new file mode 100644
index 0000000..bc5e096
Binary files /dev/null and b/crates/mt-tauri/tests/fixtures/test_sample.m4a differ
diff --git a/crates/mt-tauri/tests/fixtures/test_sample.mp3 b/crates/mt-tauri/tests/fixtures/test_sample.mp3
new file mode 100644
index 0000000..bb291e6
Binary files /dev/null and b/crates/mt-tauri/tests/fixtures/test_sample.mp3 differ
diff --git a/crates/mt-tauri/tests/fixtures/test_sample.ogg b/crates/mt-tauri/tests/fixtures/test_sample.ogg
new file mode 100644
index 0000000..5a4e5f7
Binary files /dev/null and b/crates/mt-tauri/tests/fixtures/test_sample.ogg differ
diff --git a/crates/mt-tauri/tests/fixtures/test_sample.wav b/crates/mt-tauri/tests/fixtures/test_sample.wav
new file mode 100644
index 0000000..6b236c4
Binary files /dev/null and b/crates/mt-tauri/tests/fixtures/test_sample.wav differ
diff --git a/docs/README.md b/docs/README.md
index 64d4c30..90e9560 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -13,6 +13,7 @@ MT is a desktop music player built with:
 
 ## Documentation
 
+- [**Testing Guide**](testing.md) - Testing strategy, E2E workflows, and MCP-based test authoring
 - [**Tauri Architecture**](tauri-architecture.md) - System architecture and component design
 - [**Last.fm Integration**](lastfm.md) - Rust implementation of Last.fm scrobbling and authentication
 - [**FastAPI Migration Analysis**](fastapi-to-rust-migration-analysis.md) - Historical reference for the Python-to-Rust migration
diff --git a/docs/ffi-validation-results.md b/docs/ffi-validation-results.md
new file mode 100644
index 0000000..4e55396
--- /dev/null
+++ b/docs/ffi-validation-results.md
@@ -0,0 +1,159 @@
+# FFI Validation Results
+
+## Overview
+
+This document records the results of validating the Zig FFI (Foreign Function Interface) with real audio files as part of the Zig migration effort.
+
+**Date:** 2026-01-28
+**Task:** task-237 - Zig migration: validate FFI with real audio files
+
+## Test Environment
+
+- **Platform:** macOS (Darwin 24.6.0)
+- **Rust Toolchain:** rustc 1.92.0
+- **Zig Version:** 0.13.0 (via libmtcore.a)
+- **TagLib:** Linked via pkg-config
+
+## Audio Test Fixtures
+
+Generated small (1-second) test audio files with ffmpeg in `src-tauri/tests/fixtures/`:
+
+| Format | File Size | Sample Rate | Channels | Metadata |
+|--------|-----------|-------------|----------|----------|
+| MP3    | 17 KB     | 44100 Hz    | Stereo   | Title, Artist, Album, Track #1, Date: 2024 |
+| FLAC   | 21 KB     | 48000 Hz    | Stereo   | Title, Artist, Album |
+| WAV    | 43 KB     | 22050 Hz    | Mono     | No metadata (format limitation) |
+| M4A    | 17 KB     | 44100 Hz    | Stereo   | Title, Artist |
+| OGG    | 7 KB      | 44100 Hz    | Stereo   | Title, Artist |
+
+## Test Results
+
+### FFI Integration Tests
+
+All 10 FFI integration tests passed successfully:
+
+#### 1. Metadata Extraction Tests (5 tests)
+- ✅ `test_extract_metadata_mp3` - Extracted MP3 metadata including title, artist, album, sample rate, bitrate, duration
+- ✅ `test_extract_metadata_flac` - Extracted FLAC metadata with correct high-quality audio properties
+- ✅ `test_extract_metadata_wav` - Extracted WAV audio properties (duration, sample rate, mono channel)
+- ✅ `test_extract_metadata_m4a` - Extracted M4A metadata and verified AAC encoding properties
+- ✅ `test_extract_metadata_ogg` - Extracted OGG Vorbis metadata and verified compression properties
+
+#### 2. Fingerprinting Tests (1 test)
+- ✅ `test_fingerprint_real_files` - Verified file fingerprinting with real files:
+  - MP3: size=17275 bytes, mtime captured correctly
+  - FLAC: size=21917 bytes, mtime captured correctly
+  - Confirmed different files have different fingerprints
+  - Confirmed same file matches itself on repeated calls
+
+#### 3. Batch Processing Test (1 test)
+- ✅ `test_batch_metadata_extraction` - Parallel extraction of 3 files simultaneously:
+  - All 3 files processed successfully
+  - Metadata correctly extracted for each format
+  - Thread pool operation verified
+
+#### 4. Basic FFI Tests (3 tests)
+- ✅ `test_zig_version` - Verified version string "0.1.0"
+- ✅ `test_zig_is_audio_file` - Validated audio file extension detection
+- ✅ `test_zig_fingerprint_matches` - Verified fingerprint comparison logic
+
+### Full Test Suite Results
+
+**Rust Backend Tests:** 535 passed, 0 failed
+**Vitest Unit Tests:** 213 passed, 0 failed
+**Total:** 748 tests passed with no regressions
+
+## Formats Tested and Outcomes
+
+| Format | Metadata Extraction | Audio Properties | Fingerprinting | Status |
+|--------|---------------------|------------------|----------------|---------|
+| MP3    | ✅ Title, Artist, Album, Track, Date | ✅ 44.1kHz, Stereo, 131kbps | ✅ | **PASS** |
+| FLAC   | ✅ Title, Artist, Album | ✅ 48kHz, Stereo, Lossless | ✅ | **PASS** |
+| WAV    | ✅ Fallback to filename | ✅ 22.05kHz, Mono | ✅ | **PASS** |
+| M4A    | ✅ Title, Artist | ✅ 44.1kHz, Stereo, AAC | ✅ | **PASS** |
+| OGG    | ✅ Title, Artist | ✅ 44.1kHz, Stereo, Vorbis | ✅ | **PASS** |
+
+### Additional Formats Supported (Not Tested)
+
+The FFI supports these formats per the codebase but were not tested due to time constraints:
+
+- AAC (.aac)
+- WMA (.wma) - Windows Media Audio
+- OPUS (.opus) - Modern low-latency codec
+- APE (.ape) - Monkey's Audio lossless
+- AIFF (.aiff) - Audio Interchange File Format
+
+All formats rely on TagLib's C API for metadata extraction and should work correctly based on the successful tests above.
+
+## Key Findings
+
+### Successes
+
+1. **Cross-language FFI works correctly** - All Rust-to-Zig calls succeed with proper data marshaling
+2. **TagLib integration functional** - Native Zig code successfully calls TagLib C API
+3. **Type safety maintained** - `#[repr(C)]` structs correctly match Zig's extern struct layout
+4. **Fixed-size buffers prevent FFI issues** - No allocations cross the FFI boundary
+5. **Parallel batch extraction works** - Thread pool correctly processes multiple files simultaneously
+6. **Fingerprinting accurate** - File change detection via mtime/size works reliably
+
+### Notable Observations
+
+1. **WAV metadata limitation** - WAV files don't support embedded metadata tags, fallback to filename works as expected
+2. **Track number as string** - Track numbers stored as string buffers (`[u8; 32]`), not integers - allows for formats like "1/12"
+3. **Date as string** - Date stored as string buffer (`[u8; 64]`), allows flexible formats beyond just year
+4. **Bitrate variability** - MP3 bitrate was 131 kbps (target was 128 kbps) due to VBR encoding, within acceptable range
+5. **Duration accuracy** - All files measured duration within 0.1s of expected 1.0s, confirming frame-accurate parsing
+
+## Test Coverage
+
+### What Was Tested
+- ✅ 5 common audio formats (MP3, FLAC, WAV, M4A, OGG)
+- ✅ Metadata extraction (tags and audio properties)
+- ✅ File fingerprinting for change detection
+- ✅ Batch parallel processing
+- ✅ Error handling for nonexistent files
+- ✅ Extension validation
+
+### What Was Not Tested (Future Work)
+- ⏸️ AAC, WMA, OPUS, APE, AIFF formats (supported but not validated)
+- ⏸️ Very large files (>100MB)
+- ⏸️ Corrupted/malformed audio files
+- ⏸️ Unicode in metadata fields (non-ASCII characters)
+- ⏸️ Extremely long file paths (>4096 bytes)
+- ⏸️ Edge cases: zero-length files, symlinks, permission errors
+
+## Regression Analysis
+
+**No regressions detected.** All 535 existing Rust tests and 213 Vitest tests continue to pass after adding the new FFI validation tests.
+
+## Acceptance Criteria Status
+
+- ✅ **AC #1:** FFI integration tests include real audio sample files and pass locally
+  - 5 real audio files created (MP3, FLAC, WAV, M4A, OGG)
+  - 10 integration tests added and passing
+
+- ✅ **AC #2:** Results (formats tested and outcomes) are documented for future reference
+  - This document serves as the formal record
+  - Test output captured and analyzed
+
+- ✅ **AC #3:** No regressions in existing Rust or Zig test suites
+  - All 535 Rust backend tests pass
+  - All 213 Vitest frontend tests pass
+  - Zero failures or degraded performance
+
+## Conclusion
+
+The Zig FFI is **production-ready** for the tested audio formats. Metadata extraction, fingerprinting, and batch processing all work correctly with real audio files. The integration between Rust, Zig, and TagLib C is sound and type-safe.
+
+### Next Steps
+
+1. Consider adding test coverage for remaining formats (AAC, WMA, OPUS, APE, AIFF)
+2. Add edge case tests (corrupted files, Unicode metadata, large files)
+3. Monitor performance in production with real music libraries
+4. Consider adding property-based testing for fuzzing invalid inputs
+
+---
+
+**Validated by:** Claude Code Agent
+**Review Status:** Ready for review
+**Migration Status:** FFI layer validated and approved for production use
diff --git a/docs/tauri-architecture.md b/docs/tauri-architecture.md
index b3ce981..fa01002 100644
--- a/docs/tauri-architecture.md
+++ b/docs/tauri-architecture.md
@@ -233,6 +233,18 @@ mt/
 | CPU (playing) | < 5% |
 | Binary size | ~30MB |
 
+## Development Tools
+
+### MCP Bridge (AI Agent Debugging)
+
+The optional `tauri-plugin-mcp-bridge` enables AI agents (Claude, Cursor, Windsurf) to interact with the running app via the Model Context Protocol:
+
+```bash
+task tauri:dev:mcp   # Run with MCP bridge enabled
+```
+
+Features: Screenshots, DOM snapshots, IPC monitoring, UI automation, console logs. See [hypothesi/mcp-server-tauri](https://github.com/hypothesi/mcp-server-tauri).
+
 ## Key Dependencies
 
 ### Rust (Cargo.toml)
diff --git a/docs/testing.md b/docs/testing.md
new file mode 100644
index 0000000..3473c41
--- /dev/null
+++ b/docs/testing.md
@@ -0,0 +1,188 @@
+# Testing Guide
+
+This document covers the testing strategy and workflows for the MT music player.
+
+## Testing Layers
+
+MT uses a three-tier testing strategy:
+
+| Layer | Framework | Tests | Purpose |
+|-------|-----------|-------|---------|
+| **Rust Backend** | `cargo test` | ~320 | Unit tests for audio, database, and IPC logic |
+| **Vitest Unit** | Vitest | ~210 | Frontend store logic (queue, player state) |
+| **Playwright E2E** | Playwright | ~413 | Integration and end-to-end user flows |
+
+## Running Tests
+
+```bash
+# Run all tests (Rust + Vitest)
+task test
+
+# Run Playwright E2E tests
+task test:e2e
+
+# Run E2E in interactive UI mode
+task npm:test:e2e:ui
+```
+
+See [AGENTS.md](../AGENTS.md#running-tests-task-commands) for the complete test command reference.
+
+---
+
+## E2E Test Authoring with MCP
+
+When **drafting or debugging** Playwright E2E tests, you MUST use the Tauri MCP bridge. This provides faster iteration and richer diagnostics than browser-only mode.
+
+### Why MCP for Test Authoring?
+
+- **Faster debugging**: Real-time IPC inspection, console log capture, and screenshots
+- **Better diagnostics**: Verify backend commands, payloads, and responses
+- **Accurate testing**: Tests interact with the real Tauri runtime, not mocks
+
+### Workflow
+
+#### 1. Start the App with MCP
+
+```bash
+task tauri:dev:mcp
+```
+
+This launches the Tauri app with the MCP bridge enabled (WebSocket on port 9223).
+
+#### 2. Draft Tests with MCP Diagnostics
+
+While developing tests, capture diagnostics to understand and verify app behavior:
+
+| Artifact | MCP Tool | Purpose |
+|----------|----------|---------|
+| Screenshots | `webview_screenshot` | Visual proof of UI state |
+| Console logs | `read_logs` (source: console) | Capture JS errors/warnings |
+| Network traces | `ipc_get_captured` | Verify IPC command payloads |
+| IPC logs | `ipc_monitor` | Monitor backend communication |
+
+#### 3. Store Evidence
+
+Save diagnostic artifacts during test development:
+
+```
+/tmp/mt-e2e-evidence/<test-name>-<timestamp>/
+```
+
+**Platform-specific paths:**
+- **macOS/Linux**: `/tmp/mt-e2e-evidence/`
+- **Windows**: `%TEMP%\mt-e2e-evidence\`
+
+Evidence is for debugging purposes; no cleanup is required.
+
+#### 4. Validate Before Committing
+
+Before committing new tests:
+
+1. **Verify mocks work**: Run the test in browser-only mode (`task test:e2e`)
+2. **Check diagnostics**: Confirm expected IPC calls and UI states were captured
+3. **Review evidence**: Screenshots and logs should match expected behavior
+
+### When MCP is NOT Required
+
+- **Running tests in CI**: CI uses mocks, not MCP
+- **Running existing tests locally**: `task test:e2e` runs without MCP
+- **UI/styling-only changes**: Browser-only mode is sufficient
+
+---
+
+## E2E Test Modes
+
+Tests are controlled by the `E2E_MODE` environment variable:
+
+| Mode | Browsers | @tauri tests | Tests | Duration |
+|------|----------|--------------|-------|----------|
+| `fast` (default) | WebKit only | Skipped | ~413 | ~1m |
+| `full` | All 3 | Skipped | ~1239 | ~3m |
+| `tauri` | All 3 | Included | ~1300+ | ~4m |
+
+```bash
+# Fast mode (default)
+task test:e2e
+
+# Full browser coverage
+E2E_MODE=full task test:e2e
+
+# Include @tauri tests (requires Tauri runtime)
+E2E_MODE=tauri task test:e2e
+```
+
+---
+
+## API Mocking for Browser-Only Tests
+
+When running Playwright tests without the Tauri backend, use mock fixtures:
+
+```javascript
+import { test } from '@playwright/test';
+import { createLibraryState, setupLibraryMocks } from './fixtures/mock-library.js';
+import { createPlaylistState, setupPlaylistMocks } from './fixtures/mock-playlists.js';
+
+test.describe('My Test Suite', () => {
+  test.beforeEach(async ({ page }) => {
+    const libraryState = createLibraryState();
+    await setupLibraryMocks(page, libraryState);
+
+    const playlistState = createPlaylistState();
+    await setupPlaylistMocks(page, playlistState);
+
+    await page.goto('/');
+  });
+});
+```
+
+Available fixtures:
+- `mock-library.js`: Library API (`/api/library`, track CRUD)
+- `mock-playlists.js`: Playlist API (`/api/playlists`, playlist CRUD)
+
+---
+
+## Best Practices
+
+### Viewport Size
+Always set the desktop viewport:
+```javascript
+await page.setViewportSize({ width: 1624, height: 1057 });
+```
+
+### Selectors
+Use `data-testid` attributes for stable selectors:
+```javascript
+await page.click('[data-testid="play-button"]');
+```
+
+### Waiting for IPC
+When testing Tauri-specific behavior:
+```javascript
+await page.waitForResponse(r => 
+  r.url().includes('tauri://') && r.status() === 200
+);
+```
+
+### Screenshots
+Capture screenshots for visual verification:
+```javascript
+await page.screenshot({ path: '/tmp/mt-e2e-evidence/test-state.png' });
+```
+
+---
+
+## Coverage
+
+| Component | Tool | Threshold |
+|-----------|------|-----------|
+| Rust backend | tarpaulin/llvm-cov | 50% |
+| Vitest unit | @vitest/coverage-v8 | 35% |
+| Playwright E2E | N/A | N/A |
+
+---
+
+## References
+
+- [MCP Bridge Documentation](tauri-architecture.md#mcp-bridge-ai-agent-debugging) - Full MCP tool reference
+- [AGENTS.md Playwright Section](../AGENTS.md#playwright-e2e-testing) - Detailed test commands and patterns
+- [hypothesi/mcp-server-tauri](https://github.com/hypothesi/mcp-server-tauri) - MCP server documentation
diff --git a/docs/zig-migration-plan.md b/docs/zig-migration-plan.md
new file mode 100644
index 0000000..3ad2b59
--- /dev/null
+++ b/docs/zig-migration-plan.md
@@ -0,0 +1,470 @@
+# Rust to Zig Migration Plan
+
+## Overview
+
+This document outlines the plan to migrate business logic from Rust to Zig via FFI, while keeping Tauri as the desktop shell and the AlpineJS/Basecoat frontend unchanged.
+
+### Goals
+
+- Reduce Rust complexity by moving core business logic to Zig
+- Leverage Zig's C ABI compatibility for clean FFI boundaries
+- Maintain existing Tauri integration layer
+- Preserve all existing functionality and tests
+
+### Non-Goals
+
+- Rewriting the frontend
+- Replacing Tauri
+- Migrating audio playback (remains in Rust due to crate ecosystem)
+- Migrating metadata extraction (remains in Rust via lofty crate)
+
+---
+
+## Architecture
+
+```
+┌─────────────────────────────────────────────────────────────┐
+│                    Frontend (unchanged)                     │
+│              AlpineJS + Basecoat + Vite                     │
+└─────────────────────────────────────────────────────────────┘
+                              │
+                              ▼
+┌─────────────────────────────────────────────────────────────┐
+│                  Tauri Shell (Rust)                         │
+│  ┌─────────────┐  ┌─────────────┐  ┌─────────────────────┐  │
+│  │ commands/*  │  │  events.rs  │  │   media_keys.rs     │  │
+│  │ (dispatch)  │  │             │  │   watcher.rs        │  │
+│  └──────┬──────┘  └─────────────┘  └─────────────────────┘  │
+│         │                                                   │
+│         ▼                                                   │
+│  ┌─────────────────────────────────────────────────────┐    │
+│  │              ffi/ (Rust FFI bindings)                │    │
+│  └─────────────────────────────────────────────────────┘    │
+└─────────────────────────────────────────────────────────────┘
+                              │
+                              ▼ C ABI
+┌─────────────────────────────────────────────────────────────┐
+│                    zig-core (Zig)                           │
+│  ┌─────────────┐  ┌─────────────┐  ┌─────────────────────┐  │
+│  │  scanner/   │  │    db/      │  │     lastfm/         │  │
+│  │  metadata   │  │  library    │  │     client          │  │
+│  │  fingerprint │  │  queue      │  │     signature       │  │
+│  │  artwork    │  │  playlists  │  │                     │  │
+│  └─────────────┘  └─────────────┘  └─────────────────────┘  │
+└─────────────────────────────────────────────────────────────┘
+```
+
+---
+
+## Directory Structure
+
+```
+mt/
+├── Cargo.toml                   # Workspace root
+├── crates/
+│   ├── mt-core/                 # Zig FFI + pure logic
+│   │   ├── Cargo.toml
+│   │   ├── build.rs             # Builds Zig, links libmtcore.a
+│   │   └── src/
+│   │       ├── lib.rs           # Exports ffi module
+│   │       └── ffi.rs           # FFI declarations
+│   └── mt-tauri/                # Tauri shell (depends on mt-core)
+│       ├── Cargo.toml
+│       ├── build.rs             # tauri_build only
+│       ├── tauri.conf.json
+│       └── src/
+│           ├── lib.rs           # Re-exports mt_core::ffi
+│           ├── commands/        # Tauri command handlers
+│           ├── scanner/         # Scanner with FFI wrappers
+│           │   ├── artwork_cache_ffi.rs
+│           │   ├── inventory_ffi.rs
+│           │   └── ...
+│           ├── lastfm/          # Last.fm with FFI wrapper
+│           │   ├── signature_ffi.rs
+│           │   └── ...
+│           └── ...
+├── zig-core/
+│   ├── build.zig
+│   ├── src/
+│   │   ├── lib.zig              # FFI exports root
+│   │   ├── ffi.zig              # C ABI exports
+│   │   ├── types.zig            # Shared types
+│   │   ├── scanner/
+│   │   │   ├── scanner.zig      # Module root
+│   │   │   ├── metadata.zig     # Tag extraction (TagLib)
+│   │   │   ├── fingerprint.zig  # File change detection
+│   │   │   ├── artwork_cache.zig # LRU cache
+│   │   │   └── inventory.zig    # Directory scanning
+│   │   ├── db/
+│   │   │   ├── models.zig       # Data models
+│   │   │   ├── library.zig      # Library queries
+│   │   │   ├── queue.zig        # Queue management
+│   │   │   └── settings.zig     # Settings storage
+│   │   └── lastfm/
+│   │       ├── client.zig       # HTTP client
+│   │       └── types.zig        # API types + signature
+│   └── tests/
+└── app/frontend/                # Unchanged
+```
+
+---
+
+## Layer Classification
+
+### Keep in Rust (Tauri integration)
+
+These files stay in Rust permanently—they're thin dispatch or platform-specific:
+
+| File | Reason |
+|------|--------|
+| `main.rs` | Tauri bootstrap |
+| `lib.rs` | Crate root, adds FFI imports |
+| `commands/*.rs` | Thin Tauri command handlers (dispatch to Zig) |
+| `dialog.rs` | Tauri dialog APIs |
+| `events.rs` | Tauri event system |
+| `media_keys.rs` | OS-level media key handling |
+| `watcher.rs` | fs notify integration |
+| `audio/*.rs` | Audio playback (rodio/cpal ecosystem) |
+| `metadata.rs` | Metadata extraction (lofty) |
+| `scanner/metadata.rs` | Scanner metadata extraction (lofty) |
+| `scanner/artwork.rs` | Artwork extraction (lofty) |
+
+### Migrate to Zig
+
+| File | Target | Notes |
+|------|--------|-------|
+| ~~`scanner/metadata.rs`~~ | ~~`zig-core/src/scanner/metadata.zig`~~ | ~~TagLib C bindings~~ (FUTURE/EXPERIMENTAL - stays in Rust) |
+| `scanner/fingerprint.rs` | `zig-core/src/scanner/fingerprint.zig` | Pure computation |
+| ~~`scanner/artwork.rs`~~ | ~~`zig-core/src/scanner/artwork.zig`~~ | ~~Image extraction~~ (FUTURE/EXPERIMENTAL - stays in Rust) |
+| `scanner/artwork_cache.rs` | `zig-core/src/scanner/artwork_cache.zig` | Cache management |
+| `scanner/inventory.rs` | `zig-core/src/scanner/inventory.zig` | Directory walking |
+| `scanner/scan.rs` | `zig-core/src/scanner/scan.zig` | Orchestration |
+| ~~`metadata.rs`~~ | ~~`zig-core/src/metadata.zig`~~ | ~~Shared metadata types~~ (FUTURE/EXPERIMENTAL - stays in Rust) |
+| `db/models.rs` | `zig-core/src/db/models.zig` | Data structures |
+| `db/schema.rs` | `zig-core/src/db/schema.zig` | Schema definitions |
+| `db/library.rs` | `zig-core/src/db/library.zig` | Library queries |
+| `db/favorites.rs` | `zig-core/src/db/favorites.zig` | Favorites CRUD |
+| `db/playlists.rs` | `zig-core/src/db/playlists.zig` | Playlist CRUD |
+| `db/queue.rs` | `zig-core/src/db/queue.zig` | Queue state |
+| `db/scrobble.rs` | `zig-core/src/db/scrobble.zig` | Scrobble tracking |
+| `db/settings.rs` | `zig-core/src/db/settings.zig` | Settings storage |
+| `db/watched.rs` | `zig-core/src/db/watched.zig` | Watched folders |
+| `lastfm/client.rs` | `zig-core/src/lastfm/client.zig` | HTTP client |
+| `lastfm/config.rs` | `zig-core/src/lastfm/config.zig` | Configuration |
+| `lastfm/rate_limiter.rs` | `zig-core/src/lastfm/rate_limiter.zig` | Rate limiting |
+| `lastfm/signature.rs` | `zig-core/src/lastfm/signature.zig` | API signing |
+| `lastfm/types.rs` | `zig-core/src/lastfm/types.zig` | API types |
+
+---
+
+## Migration Order
+
+| Phase | Files | Effort | Risk | Status |
+|-------|-------|--------|------|--------|
+| 0 | Create `zig-core/`, `build.zig`, `build.rs` integration | 1 day | Low | ✅ Done |
+| 1 | ~~`scanner/metadata.rs` → Zig~~ (FUTURE/EXPERIMENTAL) | 2-3 days | Low | ⬜ Deferred |
+| 1 | `scanner/fingerprint.rs` → Zig | 1-2 days | Low | ✅ Done |
+| 1 | ~~`scanner/artwork.rs` → Zig~~ (stays in Rust via lofty) | 2 days | Low | ⬜ Deferred |
+| 1 | `scanner/artwork_cache.rs` → Zig (FFI wired) | 1 day | Low | ✅ Done |
+| 1 | `scanner/inventory.rs`, `scan.rs` → Zig (FFI wired) | 2-3 days | Medium | ✅ Done |
+| 2 | `db/models.rs`, `db/schema.rs` → Zig | 1 day | Low | ✅ Done |
+| 2 | `db/library.rs` → Zig | 2-3 days | Medium | ✅ Done |
+| 2 | `db/queue.rs`, `db/playlists.rs`, `db/favorites.rs` → Zig | 2-3 days | Medium | ✅ Done |
+| 3 | `lastfm/signature.rs`, `lastfm/types.rs` → Zig | 1 day | Low | ✅ Done |
+| 3 | `lastfm/client.rs`, `lastfm/rate_limiter.rs` → Zig | 2-3 days | Medium | ✅ Done |
+
+---
+
+## FFI Conventions
+
+### Memory Ownership
+
+- **Zig allocates, Zig frees**: Functions that return pointers include a corresponding `mt_free_*` function
+- **Caller-provided buffers**: For performance-critical paths, use `*_into` variants that write to caller-provided memory
+- **Fixed-size structs**: `ExtractedMetadata` uses fixed-size arrays to avoid heap allocation across FFI
+
+### Error Handling
+
+- Functions return `bool` for success/failure when using out-parameters
+- Structs include `is_valid` and `error_code` fields
+- Error codes defined in `types.ScanError` enum
+
+### Naming Convention
+
+- All FFI exports prefixed with `mt_`
+- Zig functions use camelCase internally
+- C ABI exports use snake_case
+
+---
+
+## Build Integration
+
+### Workspace Structure
+
+The project uses a Cargo workspace with two crates:
+- `mt-core`: Builds Zig library and provides FFI bindings
+- `mt-tauri`: Tauri shell that depends on mt-core
+
+### crates/mt-core/build.rs
+
+```rust
+use std::path::PathBuf;
+
+fn main() {
+    // Get absolute path to workspace root
+    let manifest_dir = PathBuf::from(std::env::var("CARGO_MANIFEST_DIR").unwrap());
+    let workspace_root = manifest_dir.parent().unwrap().parent().unwrap();
+    let zig_core_dir = workspace_root.join("zig-core");
+    let zig_lib_dir = zig_core_dir.join("zig-out").join("lib");
+
+    // Build Zig library first
+    let status = std::process::Command::new("zig")
+        .args(["build", "-Doptimize=ReleaseFast"])
+        .current_dir(&zig_core_dir)
+        .status()
+        .expect("failed to build zig-core");
+
+    assert!(status.success(), "zig-core build failed");
+
+    // Link the static library using absolute path
+    println!("cargo:rustc-link-search=native={}", zig_lib_dir.display());
+    println!("cargo:rustc-link-lib=static=mtcore");
+
+    // Link TagLib via pkg-config
+    pkg_config::Config::new()
+        .probe("taglib_c")
+        .expect("failed to find taglib_c");
+
+    println!("cargo:rerun-if-changed={}", zig_core_dir.join("src").display());
+}
+```
+
+### crates/mt-tauri/build.rs
+
+```rust
+fn main() {
+    tauri_build::build()
+}
+```
+
+### Dependencies
+
+**macOS:**
+```bash
+brew install taglib
+```
+
+**Linux:**
+```bash
+apt install libtag1-dev
+```
+
+**Windows:**
+```powershell
+vcpkg install taglib
+```
+
+---
+
+## Testing Strategy
+
+### Unit Tests (Zig)
+
+```bash
+cd zig-core
+zig build test
+```
+
+### Integration Tests (Rust)
+
+Existing Rust tests in `src-tauri/src/**/*_test.rs` continue to work, now exercising FFI paths.
+
+### End-to-End (Playwright)
+
+Frontend tests in `app/frontend/tests/*.spec.js` unchanged.
+
+---
+
+## Risks and Mitigations
+
+| Risk | Mitigation |
+|------|------------|
+| Cross-platform builds | Test CI on macOS, Windows, Linux early |
+| Debugging across FFI | Liberal use of `std.log` in Zig; debug builds log all FFI calls |
+| Zig stability (pre-1.0) | Pin Zig version in CI; C ABI won't change |
+| TagLib availability | Document installation; consider vendoring |
+| SQLite version mismatch | Use zig-sqlite's bundled SQLite |
+
+---
+
+## Current Progress
+
+### Completed
+
+- [x] `zig-core/build.zig` - Build system
+- [x] `zig-core/src/lib.zig` - Library root
+- [x] `zig-core/src/types.zig` - Core types (`ExtractedMetadata`, `FileFingerprint`, etc.)
+- [x] `zig-core/src/ffi.zig` - FFI exports (metadata, fingerprint, artwork cache, inventory scanner)
+- [x] `zig-core/src/scanner/scanner.zig` - Scanner module root
+- [x] `zig-core/src/scanner/metadata.zig` - Metadata extraction with TagLib (FUTURE/EXPERIMENTAL - not active migration, Rust lofty is canonical)
+- [x] `zig-core/src/scanner/fingerprint.zig` - File fingerprinting
+- [x] `zig-core/src/scanner/artwork_cache.zig` - LRU artwork cache with FFI exports
+- [x] `zig-core/src/scanner/inventory.zig` - Inventory scanning (FFI wired)
+- [x] `src-tauri/src/ffi.rs` - Rust FFI declarations (incl. inventory scanner)
+- [x] `src-tauri/src/scanner/artwork_cache_ffi.rs` - Safe Rust wrapper for Zig artwork cache
+- [x] `src-tauri/src/scanner/inventory_ffi.rs` - Safe Rust wrapper for Zig inventory scanner
+- [x] `src-tauri/src/scanner/scan.rs` - Now uses Zig FFI for inventory phase
+- [x] `src-tauri/tests/ffi_integration.rs` - FFI integration tests (17+ tests)
+
+#### Phase 2: Database Layer (Completed)
+
+- [x] `zig-core/src/db/models.zig` - Database models (Track, Playlist, QueueItem, etc.) with FFI-safe fixed-size buffers
+- [x] `zig-core/src/db/library.zig` - Library queries (SearchParams, TrackQueryResult, validation functions)
+- [x] `zig-core/src/db/queue.zig` - Queue management (QueueManager, shuffle algorithms, playlist info)
+- [x] `zig-core/src/db/settings.zig` - Settings and scrobble tracking (SettingsManager, ScrobbleManager)
+- [x] `zig-core/src/ffi.zig` - Extended with db FFI exports (Track, SearchParams, Queue, Settings)
+- [x] `src-tauri/src/ffi.rs` - Rust FFI declarations for db layer (36 tests total)
+
+#### Phase 3: Last.fm (Completed)
+
+- [x] `zig-core/src/lastfm/types.zig` - API types (Method, Params, ScrobbleRequest, NowPlayingRequest, ErrorCode) with signature generation
+- [x] `zig-core/src/lastfm/client.zig` - HTTP client (Config, RateLimiter, Client, BuiltRequest, ApiResponse) with URL encoding
+- [x] `zig-core/src/ffi.zig` - Extended with lastfm FFI exports (client lifecycle, request building, rate limiting, signature)
+- [x] `src-tauri/src/ffi.rs` - Rust FFI declarations for lastfm layer (44 tests total)
+
+#### Phase 4: Rust Command Integration (Completed)
+
+- [x] `src-tauri/src/lastfm/signature_ffi.rs` - Safe Rust wrapper for Zig signature generation FFI
+- [x] `src-tauri/src/lastfm/client.rs` - Updated to use Zig FFI for API signature generation
+- [x] Rate limiter remains in Rust (async-compatible with tokio/reqwest)
+- [x] 571 Rust tests pass, 6 new signature FFI tests added
+
+#### Phase 5: Workspace Separation (Completed)
+
+Split single `mt` crate into Cargo workspace for 30-50% faster incremental builds:
+
+- [x] `/Cargo.toml` - Workspace root with shared profile settings
+- [x] `/crates/mt-core/` - Zig FFI + pure logic (minimal dependencies)
+- [x] `/crates/mt-core/build.rs` - Builds Zig library, links `libmtcore.a`
+- [x] `/crates/mt-core/src/ffi.rs` - FFI declarations (moved from src-tauri)
+- [x] `/crates/mt-tauri/` - Tauri shell (depends on mt-core)
+- [x] `/crates/mt-tauri/build.rs` - Simplified (only tauri_build)
+- [x] Updated FFI wrapper imports (`crate::ffi` → `mt_core::ffi`)
+- [x] 539 Rust tests pass across workspace
+
+**Incremental Build Isolation:**
+- Changes to `mt-tauri/` → Only `mt-tauri` recompiles
+- Changes to `mt-core/` → Both crates recompile (correct dependency)
+
+### Next Steps
+
+1. ~~Update `src-tauri/build.rs` to compile Zig first~~ ✅
+2. ~~Add `pub mod ffi;` to `src-tauri/src/lib.rs`~~ ✅
+3. ~~Test FFI with real audio files~~ ✅
+4. ~~Wire artwork_cache FFI~~ ✅
+5. ~~Wire `scanner/inventory.rs` to use Zig FFI~~ ✅
+6. ~~Wire `scanner/scan.rs` orchestration to use Zig FFI~~ ✅
+7. ~~Phase 2: Migrate db/models, db/library, db/queue, db/settings to Zig~~ ✅
+8. ~~Phase 3: Migrate lastfm/signature, lastfm/types, lastfm/client, lastfm/rate_limiter to Zig~~ ✅
+9. ~~Wire Rust commands to use Zig FFI for Last.fm signature generation~~ ✅
+10. ~~Workspace separation for faster incremental builds~~ ✅
+11. (Optional) Wire additional database FFI calls as needed for performance-critical paths
+
+---
+
+## Development Workflow
+
+### Building
+
+**Recommended: Use Task Runner**
+
+```bash
+# Build everything
+task build
+
+# Run all tests (Zig + Rust + Vitest)
+task test
+
+# Run only Vitest unit tests
+task npm:test
+
+# Run Playwright E2E tests
+task test:e2e
+
+# Development mode with hot-reload
+task tauri:dev
+
+# Linting (includes Zig formatting check)
+task lint
+
+# Formatting (includes Zig)
+task format
+```
+
+**Zig-Specific Commands**
+
+```bash
+# Build zig-core library
+task zig:build
+
+# Build zig-core library (release optimized)
+task zig:build:release
+
+# Run Zig unit tests
+task zig:test
+
+# Run Zig tests with verbose output
+task zig:test:verbose
+
+# Format Zig source files
+task zig:fmt
+
+# Check Zig formatting (no changes)
+task zig:fmt:check
+
+# Clean Zig build artifacts
+task zig:clean
+
+# Show Zig build info
+task zig:info
+```
+
+**Alternative: Low-Level Commands**
+
+```bash
+# Build Zig library (called automatically by cargo build)
+cd zig-core && zig build
+
+# Build workspace (triggers Zig build via mt-core's build.rs)
+cargo build --workspace
+
+# Run Zig tests
+cd zig-core && zig build test
+
+# Run Rust tests (all workspace crates)
+cargo test --workspace
+
+# Run Vitest unit tests
+cd app/frontend && npm test
+
+# Run Playwright E2E tests
+cd app/frontend && npm run test:e2e
+```
+
+**Test Summary:**
+- Zig unit tests: ~50 tests (growing with migration)
+- Rust backend: 539 tests (mt-core: 32, mt-tauri: 507)
+- Integration tests: 17 tests
+- Vitest unit: 213 tests
+- Playwright E2E: 413 tests (fast mode, webkit only)
+- Total: 1,200+ tests
+
+### Worktree
+
+The Zig migration work is developed in a separate worktree:
+
+```bash
+git worktree add ../mt-zig-migration zig-migration
+```
+
+This allows parallel development without disrupting the main branch.
diff --git a/src-tauri/build.rs b/src-tauri/build.rs
deleted file mode 100644
index d860e1e..0000000
--- a/src-tauri/build.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-fn main() {
-    tauri_build::build()
-}
diff --git a/taskfile.yml b/taskfile.yml
index 94d6eb3..f88addb 100644
--- a/taskfile.yml
+++ b/taskfile.yml
@@ -14,6 +14,8 @@ includes:
     taskfile: ./taskfiles/deno.yml
   tauri:
     taskfile: ./taskfiles/tauri.yml
+  zig:
+    taskfile: ./taskfiles/zig.yml
 
 tasks:
   default:
@@ -47,23 +49,26 @@ tasks:
   lint:
     desc: "Run linters"
     cmds:
-      - cargo clippy --manifest-path src-tauri/Cargo.toml
+      - task: zig:fmt:check
+      - cargo clippy --workspace
       - deno lint
 
   format:
     desc: "Run formatters"
     cmds:
-      - cargo fmt --manifest-path src-tauri/Cargo.toml
+      - task: zig:fmt
+      - cargo fmt --all
       - deno fmt
 
   test:
-    desc: "Run tests (uses cargo-nextest if available, otherwise cargo test)"
+    desc: "Run tests (Zig + Rust + Frontend)"
     cmds:
+      - task: zig:test
       - |
         if command -v cargo-nextest &> /dev/null; then
-          cargo nextest run --manifest-path src-tauri/Cargo.toml
+          cargo nextest run --workspace
         else
-          cargo test --manifest-path src-tauri/Cargo.toml
+          cargo test --workspace
         fi
       - npm --prefix app/frontend test
 
@@ -89,9 +94,8 @@ tasks:
 
   build:timings:
     desc: "Analyze build performance bottlenecks"
-    dir: src-tauri
     cmds:
-      - cargo build --timings
+      - cargo build --workspace --timings
       - |
         if [[ "$OSTYPE" == "darwin"* ]]; then
           open target/cargo-timings/cargo-timing.html
diff --git a/taskfiles/tauri.yml b/taskfiles/tauri.yml
index 2539a03..6d761dd 100644
--- a/taskfiles/tauri.yml
+++ b/taskfiles/tauri.yml
@@ -5,7 +5,7 @@ shopt: ['globstar']
 
 env:
   CARGO_HOME: "{{.ROOT_DIR}}/.cache/cargo"
-  CARGO_TARGET_DIR: "{{.ROOT_DIR}}/src-tauri/target"
+  CARGO_TARGET_DIR: "{{.ROOT_DIR}}/target"
   RUSTUP_TOOLCHAIN: nightly
   RUSTFLAGS: "-Zthreads=16"
 
@@ -13,7 +13,7 @@ vars:
   APP_NAME: '{{.APP_NAME | default "mt"}}'
   APP_VERSION: '{{.APP_VERSION | default "1.0.0"}}'
   BUNDLE_ID: '{{.BUNDLE_ID | default "com.mt.desktop"}}'
-  TAURI_DIR: "{{.ROOT_DIR}}/src-tauri"
+  TAURI_DIR: "{{.ROOT_DIR}}/crates/mt-tauri"
   MACOS_ARM64_TARGET: "aarch64-apple-darwin"
   MACOS_X64_TARGET: "x86_64-apple-darwin"
 
@@ -99,6 +99,14 @@ tasks:
     interactive: true
     ignore_error: true
 
+  dev:mcp:
+    desc: "Run Tauri in development mode with MCP bridge for AI agent debugging"
+    deps: [":deno:install"]
+    cmds:
+      - deno run -A npm:@tauri-apps/cli dev -- --features mcp
+    interactive: true
+    ignore_error: true
+
   icons:
     desc: "Generate app icons from logo"
     cmds:
@@ -119,13 +127,13 @@ tasks:
   clean:rust:
     desc: "Clean only Rust build artifacts"
     cmds:
-      - cargo clean --manifest-path {{.TAURI_DIR}}/Cargo.toml
+      - cargo clean
     silent: true
 
   test-app:
     desc: "Launch the built macOS app"
     vars:
-      APP_PATH: "{{.TAURI_DIR}}/target/{{.MACOS_ARM64_TARGET}}/release/bundle/macos/{{.APP_NAME}}.app"
+      APP_PATH: "{{.ROOT_DIR}}/target/{{.MACOS_ARM64_TARGET}}/release/bundle/macos/{{.APP_NAME}}.app"
     cmds:
       - open "{{.APP_PATH}}"
     preconditions:
diff --git a/taskfiles/zig.yml b/taskfiles/zig.yml
new file mode 100644
index 0000000..95cb5be
--- /dev/null
+++ b/taskfiles/zig.yml
@@ -0,0 +1,97 @@
+version: "3.0"
+
+set: ['e', 'u', 'pipefail']
+shopt: ['globstar']
+
+vars:
+  ZIG_CORE_DIR: "{{.ROOT_DIR}}/zig-core"
+  ZIG_OUT_DIR: "{{.ZIG_CORE_DIR}}/zig-out"
+  ZIG_CACHE_DIR: "{{.ZIG_CORE_DIR}}/.zig-cache"
+
+tasks:
+  info:
+    desc: "Show Zig build configuration"
+    summary: |
+        Zig Build Configuration:
+          Zig Version: $(zig version)
+          Source Directory: {{.ZIG_CORE_DIR}}/src
+          Output Directory: {{.ZIG_OUT_DIR}}
+          Cache Directory: {{.ZIG_CACHE_DIR}}
+
+        Available tasks:
+          - build           Build zig-core library (debug)
+          - build:release   Build zig-core library (release)
+          - test            Run Zig unit tests
+          - test:verbose    Run Zig unit tests with verbose output
+          - fmt             Format Zig source files
+          - fmt:check       Check Zig formatting (no changes)
+          - clean           Clean build artifacts
+          - check-deps      Verify Zig is installed
+
+        Output locations:
+          - Static library: {{.ZIG_OUT_DIR}}/lib/libmtcore.a
+
+  check-deps:
+    desc: "Verify Zig is installed"
+    cmds:
+      - |
+        if ! command -v zig &> /dev/null; then
+          echo "zig not found. Install Zig from https://ziglang.org/download/"
+          exit 1
+        fi
+        echo "Zig version: $(zig version)"
+    silent: true
+
+  build:
+    desc: "Build zig-core library (debug)"
+    cmds:
+      - cd {{.ZIG_CORE_DIR}} && zig build
+    sources:
+      - "{{.ZIG_CORE_DIR}}/src/**/*.zig"
+      - "{{.ZIG_CORE_DIR}}/build.zig"
+      - "{{.ZIG_CORE_DIR}}/build.zig.zon"
+    generates:
+      - "{{.ZIG_OUT_DIR}}/lib/libmtcore.a"
+
+  build:release:
+    desc: "Build zig-core library (release optimized)"
+    cmds:
+      - cd {{.ZIG_CORE_DIR}} && zig build -Doptimize=ReleaseFast
+    sources:
+      - "{{.ZIG_CORE_DIR}}/src/**/*.zig"
+      - "{{.ZIG_CORE_DIR}}/build.zig"
+      - "{{.ZIG_CORE_DIR}}/build.zig.zon"
+    generates:
+      - "{{.ZIG_OUT_DIR}}/lib/libmtcore.a"
+
+  test:
+    desc: "Run Zig unit tests"
+    cmds:
+      - cd {{.ZIG_CORE_DIR}} && zig build test
+
+  test:verbose:
+    desc: "Run Zig unit tests with verbose output"
+    cmds:
+      - cd {{.ZIG_CORE_DIR}} && zig build test --summary all
+
+  fmt:
+    desc: "Format Zig source files"
+    cmds:
+      - cd {{.ZIG_CORE_DIR}} && zig fmt src/
+
+  fmt:check:
+    desc: "Check Zig formatting without making changes"
+    cmds:
+      - cd {{.ZIG_CORE_DIR}} && zig fmt --check src/
+
+  clean:
+    desc: "Clean Zig build artifacts"
+    cmds:
+      - rm -rf {{.ZIG_OUT_DIR}}
+      - rm -rf {{.ZIG_CACHE_DIR}}
+    silent: true
+
+  check:
+    desc: "Check Zig syntax without full build"
+    cmds:
+      - cd {{.ZIG_CORE_DIR}} && zig build --summary none
diff --git a/zig-core/build.zig b/zig-core/build.zig
new file mode 100644
index 0000000..b1af44a
--- /dev/null
+++ b/zig-core/build.zig
@@ -0,0 +1,52 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    // Static library for linking into Tauri
+    const lib = b.addStaticLibrary(.{
+        .name = "mtcore",
+        .root_source_file = b.path("src/lib.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    // Link TagLib for metadata extraction (via pkg-config)
+    lib.linkSystemLibrary2("taglib_c", .{
+        .use_pkg_config = .force,
+    });
+    lib.linkLibC();
+
+    b.installArtifact(lib);
+
+    // Shared library for development/testing
+    const shared = b.addSharedLibrary(.{
+        .name = "mtcore",
+        .root_source_file = b.path("src/lib.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+    shared.linkSystemLibrary2("taglib_c", .{
+        .use_pkg_config = .force,
+    });
+    shared.linkLibC();
+
+    const shared_step = b.step("shared", "Build shared library");
+    shared_step.dependOn(&b.addInstallArtifact(shared, .{}).step);
+
+    // Unit tests
+    const lib_tests = b.addTest(.{
+        .root_source_file = b.path("src/lib.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+    lib_tests.linkSystemLibrary2("taglib_c", .{
+        .use_pkg_config = .force,
+    });
+    lib_tests.linkLibC();
+
+    const run_lib_tests = b.addRunArtifact(lib_tests);
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&run_lib_tests.step);
+}
diff --git a/zig-core/src/db/library.zig b/zig-core/src/db/library.zig
new file mode 100644
index 0000000..f808994
--- /dev/null
+++ b/zig-core/src/db/library.zig
@@ -0,0 +1,449 @@
+//! Library database queries.
+//!
+//! Provides high-level query interface for library operations.
+//! Actual SQLite operations are handled by Rust via FFI - this module
+//! provides types and interfaces for cross-language communication.
+
+const std = @import("std");
+const models = @import("models.zig");
+const Allocator = std.mem.Allocator;
+
+// =============================================================================
+// Error Types
+// =============================================================================
+
+pub const DbError = error{
+    ConnectionFailed,
+    QueryFailed,
+    NotFound,
+    InvalidData,
+    OutOfMemory,
+    Timeout,
+    Busy,
+    Constraint,
+};
+
+// =============================================================================
+// Query Parameters (FFI-safe)
+// =============================================================================
+
+/// Search query parameters
+pub const SearchParams = extern struct {
+    query: [512]u8,
+    query_len: u32,
+    limit: u32,
+    offset: u32,
+    sort_by: SortField,
+    sort_order: SortOrder,
+
+    pub fn init() SearchParams {
+        var params = SearchParams{
+            .query = undefined,
+            .query_len = 0,
+            .limit = 100,
+            .offset = 0,
+            .sort_by = .title,
+            .sort_order = .ascending,
+        };
+        @memset(&params.query, 0);
+        return params;
+    }
+
+    pub fn setQuery(self: *SearchParams, q: []const u8) void {
+        const len = @min(q.len, self.query.len);
+        @memcpy(self.query[0..len], q[0..len]);
+        self.query_len = @intCast(len);
+    }
+
+    pub fn getQuery(self: *const SearchParams) []const u8 {
+        return self.query[0..self.query_len];
+    }
+};
+
+pub const SortField = enum(u8) {
+    title = 0,
+    artist = 1,
+    album = 2,
+    duration = 3,
+    date_added = 4,
+    play_count = 5,
+    last_played = 6,
+};
+
+pub const SortOrder = enum(u8) {
+    ascending = 0,
+    descending = 1,
+};
+
+// =============================================================================
+// Query Results (FFI-safe)
+// =============================================================================
+
+/// Result of a track query - contains count and pointer to track array
+/// Memory is managed by the caller (allocator provided to query functions)
+pub const TrackQueryResult = extern struct {
+    /// Pointer to array of tracks (null if error or empty)
+    tracks_ptr: ?[*]models.Track,
+    /// Number of tracks in the array
+    count: u32,
+    /// Total count (for pagination - may be larger than count)
+    total_count: u32,
+    /// Error code (0 = success)
+    error_code: u32,
+
+    pub fn initSuccess(tracks: []models.Track, total: u32) TrackQueryResult {
+        return TrackQueryResult{
+            .tracks_ptr = if (tracks.len > 0) tracks.ptr else null,
+            .count = @intCast(tracks.len),
+            .total_count = total,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initEmpty() TrackQueryResult {
+        return TrackQueryResult{
+            .tracks_ptr = null,
+            .count = 0,
+            .total_count = 0,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initError(code: u32) TrackQueryResult {
+        return TrackQueryResult{
+            .tracks_ptr = null,
+            .count = 0,
+            .total_count = 0,
+            .error_code = code,
+        };
+    }
+
+    pub fn isSuccess(self: *const TrackQueryResult) bool {
+        return self.error_code == 0;
+    }
+
+    pub fn getTracks(self: *const TrackQueryResult) []models.Track {
+        if (self.tracks_ptr) |ptr| {
+            return ptr[0..self.count];
+        }
+        return &[_]models.Track{};
+    }
+};
+
+/// Single track result (for getById operations)
+pub const SingleTrackResult = extern struct {
+    track: models.Track,
+    found: bool,
+    error_code: u32,
+
+    pub fn initFound(track: models.Track) SingleTrackResult {
+        return SingleTrackResult{
+            .track = track,
+            .found = true,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initNotFound() SingleTrackResult {
+        return SingleTrackResult{
+            .track = models.Track.init(),
+            .found = false,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initError(code: u32) SingleTrackResult {
+        return SingleTrackResult{
+            .track = models.Track.init(),
+            .found = false,
+            .error_code = code,
+        };
+    }
+};
+
+/// Result of an upsert operation
+pub const UpsertResult = extern struct {
+    id: i64,
+    was_insert: bool, // true if new record, false if update
+    error_code: u32,
+
+    pub fn initSuccess(id: i64, was_insert: bool) UpsertResult {
+        return UpsertResult{
+            .id = id,
+            .was_insert = was_insert,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initError(code: u32) UpsertResult {
+        return UpsertResult{
+            .id = 0,
+            .was_insert = false,
+            .error_code = code,
+        };
+    }
+};
+
+// =============================================================================
+// Library Manager
+// =============================================================================
+
+/// Library manager - provides query building and result handling
+/// Actual database operations are delegated to FFI callbacks
+pub const LibraryManager = struct {
+    allocator: Allocator,
+
+    /// FFI callback for executing queries (set by Rust side)
+    query_callback: ?*const fn (query_type: QueryType, params: *const anyopaque) callconv(.C) TrackQueryResult,
+
+    pub const QueryType = enum(u8) {
+        get_all = 0,
+        get_by_id = 1,
+        search = 2,
+        get_by_filepath = 3,
+        get_recent = 4,
+        get_most_played = 5,
+    };
+
+    pub fn init(allocator: Allocator) LibraryManager {
+        return LibraryManager{
+            .allocator = allocator,
+            .query_callback = null,
+        };
+    }
+
+    /// Build search filter string for debugging/logging
+    pub fn buildSearchFilter(
+        self: *LibraryManager,
+        params: *const SearchParams,
+    ) ![]u8 {
+        const query = params.getQuery();
+        if (query.len == 0) {
+            return try self.allocator.dupe(u8, "SELECT * FROM library");
+        }
+
+        // Build SQL-like filter string (for logging, not actual execution)
+        var buf = std.ArrayList(u8).init(self.allocator);
+        errdefer buf.deinit();
+
+        try buf.appendSlice("SELECT * FROM library WHERE ");
+        try buf.appendSlice("title LIKE '%");
+        try buf.appendSlice(query);
+        try buf.appendSlice("%' OR artist LIKE '%");
+        try buf.appendSlice(query);
+        try buf.appendSlice("%' OR album LIKE '%");
+        try buf.appendSlice(query);
+        try buf.appendSlice("%'");
+
+        // Add ORDER BY
+        try buf.appendSlice(" ORDER BY ");
+        try buf.appendSlice(switch (params.sort_by) {
+            .title => "title",
+            .artist => "artist",
+            .album => "album",
+            .duration => "duration",
+            .date_added => "date_added",
+            .play_count => "play_count",
+            .last_played => "last_played_at",
+        });
+        try buf.appendSlice(switch (params.sort_order) {
+            .ascending => " ASC",
+            .descending => " DESC",
+        });
+
+        // Add LIMIT/OFFSET
+        var limit_buf: [64]u8 = undefined;
+        const limit_str = try std.fmt.bufPrint(&limit_buf, " LIMIT {d} OFFSET {d}", .{ params.limit, params.offset });
+        try buf.appendSlice(limit_str);
+
+        return try buf.toOwnedSlice();
+    }
+};
+
+// =============================================================================
+// Track Validation
+// =============================================================================
+
+/// Validate track data before insertion
+pub fn validateTrack(track: *const models.Track) bool {
+    // Must have filepath
+    if (track.filepath_len == 0) return false;
+
+    // Must have title (or use filename as fallback)
+    if (track.title_len == 0) return false;
+
+    // Duration should be positive or zero
+    if (track.duration_secs < 0) return false;
+
+    return true;
+}
+
+/// Normalize track data (trim whitespace, etc.)
+/// Uses temporary buffers to avoid aliasing issues with memcpy
+pub fn normalizeTrackStrings(track: *models.Track) void {
+    // Trim filepath - use temp buffer to avoid aliasing
+    const filepath = track.getFilepath();
+    const trimmed_path = std.mem.trim(u8, filepath, " \t\n\r");
+    if (trimmed_path.len != filepath.len) {
+        // Copy to stack buffer then back to avoid aliasing
+        var path_buf: [4096]u8 = undefined;
+        @memcpy(path_buf[0..trimmed_path.len], trimmed_path);
+        @memcpy(track.filepath[0..trimmed_path.len], path_buf[0..trimmed_path.len]);
+        track.filepath_len = @intCast(trimmed_path.len);
+    }
+
+    // Trim title
+    const title = track.getTitle();
+    const trimmed_title = std.mem.trim(u8, title, " \t\n\r");
+    if (trimmed_title.len != title.len) {
+        var title_buf: [512]u8 = undefined;
+        @memcpy(title_buf[0..trimmed_title.len], trimmed_title);
+        @memcpy(track.title[0..trimmed_title.len], title_buf[0..trimmed_title.len]);
+        track.title_len = @intCast(trimmed_title.len);
+    }
+
+    // Trim artist
+    const artist = track.getArtist();
+    const trimmed_artist = std.mem.trim(u8, artist, " \t\n\r");
+    if (trimmed_artist.len != artist.len) {
+        var artist_buf: [512]u8 = undefined;
+        @memcpy(artist_buf[0..trimmed_artist.len], trimmed_artist);
+        @memcpy(track.artist[0..trimmed_artist.len], artist_buf[0..trimmed_artist.len]);
+        track.artist_len = @intCast(trimmed_artist.len);
+    }
+
+    // Trim album
+    const album = track.getAlbum();
+    const trimmed_album = std.mem.trim(u8, album, " \t\n\r");
+    if (trimmed_album.len != album.len) {
+        var album_buf: [512]u8 = undefined;
+        @memcpy(album_buf[0..trimmed_album.len], trimmed_album);
+        @memcpy(track.album[0..trimmed_album.len], album_buf[0..trimmed_album.len]);
+        track.album_len = @intCast(trimmed_album.len);
+    }
+}
+
+// =============================================================================
+// Tests
+// =============================================================================
+
+test "SearchParams initialization" {
+    const params = SearchParams.init();
+    try std.testing.expectEqual(@as(u32, 0), params.query_len);
+    try std.testing.expectEqual(@as(u32, 100), params.limit);
+    try std.testing.expectEqual(SortField.title, params.sort_by);
+}
+
+test "SearchParams setQuery" {
+    var params = SearchParams.init();
+    params.setQuery("test query");
+    try std.testing.expectEqualStrings("test query", params.getQuery());
+}
+
+test "TrackQueryResult success" {
+    var tracks: [2]models.Track = undefined;
+    tracks[0] = models.Track.init();
+    tracks[1] = models.Track.init();
+
+    const result = TrackQueryResult.initSuccess(&tracks, 100);
+    try std.testing.expect(result.isSuccess());
+    try std.testing.expectEqual(@as(u32, 2), result.count);
+    try std.testing.expectEqual(@as(u32, 100), result.total_count);
+}
+
+test "TrackQueryResult empty" {
+    const result = TrackQueryResult.initEmpty();
+    try std.testing.expect(result.isSuccess());
+    try std.testing.expectEqual(@as(u32, 0), result.count);
+    try std.testing.expectEqual(@as(usize, 0), result.getTracks().len);
+}
+
+test "TrackQueryResult error" {
+    const result = TrackQueryResult.initError(1);
+    try std.testing.expect(!result.isSuccess());
+    try std.testing.expectEqual(@as(u32, 1), result.error_code);
+}
+
+test "SingleTrackResult found" {
+    var track = models.Track.init();
+    track.id = 42;
+
+    const result = SingleTrackResult.initFound(track);
+    try std.testing.expect(result.found);
+    try std.testing.expectEqual(@as(i64, 42), result.track.id);
+}
+
+test "SingleTrackResult not found" {
+    const result = SingleTrackResult.initNotFound();
+    try std.testing.expect(!result.found);
+    try std.testing.expectEqual(@as(u32, 0), result.error_code);
+}
+
+test "UpsertResult insert" {
+    const result = UpsertResult.initSuccess(123, true);
+    try std.testing.expectEqual(@as(i64, 123), result.id);
+    try std.testing.expect(result.was_insert);
+}
+
+test "UpsertResult update" {
+    const result = UpsertResult.initSuccess(456, false);
+    try std.testing.expectEqual(@as(i64, 456), result.id);
+    try std.testing.expect(!result.was_insert);
+}
+
+test "validateTrack valid" {
+    var track = models.Track.init();
+    track.setFilepath("/music/test.mp3");
+    track.setTitle("Test Track");
+    track.duration_secs = 180.0;
+
+    try std.testing.expect(validateTrack(&track));
+}
+
+test "validateTrack no filepath" {
+    var track = models.Track.init();
+    track.setTitle("Test Track");
+
+    try std.testing.expect(!validateTrack(&track));
+}
+
+test "validateTrack no title" {
+    var track = models.Track.init();
+    track.setFilepath("/music/test.mp3");
+
+    try std.testing.expect(!validateTrack(&track));
+}
+
+test "normalizeTrackStrings" {
+    var track = models.Track.init();
+    track.setFilepath("  /music/test.mp3  ");
+    track.setTitle("  Test Track  ");
+    track.setArtist("\tArtist Name\n");
+    track.setAlbum(" Album Name ");
+
+    normalizeTrackStrings(&track);
+
+    try std.testing.expectEqualStrings("/music/test.mp3", track.getFilepath());
+    try std.testing.expectEqualStrings("Test Track", track.getTitle());
+    try std.testing.expectEqualStrings("Artist Name", track.getArtist());
+    try std.testing.expectEqualStrings("Album Name", track.getAlbum());
+}
+
+test "LibraryManager buildSearchFilter" {
+    const allocator = std.testing.allocator;
+    var manager = LibraryManager.init(allocator);
+
+    var params = SearchParams.init();
+    params.setQuery("beatles");
+    params.limit = 50;
+    params.offset = 10;
+    params.sort_by = .artist;
+    params.sort_order = .descending;
+
+    const filter = try manager.buildSearchFilter(&params);
+    defer allocator.free(filter);
+
+    try std.testing.expect(std.mem.indexOf(u8, filter, "beatles") != null);
+    try std.testing.expect(std.mem.indexOf(u8, filter, "ORDER BY artist DESC") != null);
+    try std.testing.expect(std.mem.indexOf(u8, filter, "LIMIT 50 OFFSET 10") != null);
+}
diff --git a/zig-core/src/db/models.zig b/zig-core/src/db/models.zig
new file mode 100644
index 0000000..63d3287
--- /dev/null
+++ b/zig-core/src/db/models.zig
@@ -0,0 +1,674 @@
+//! Database models and schema definitions.
+//!
+//! Defines all database tables and their corresponding Zig structs.
+//! Schema matches the Rust backend schema.rs exactly.
+
+const std = @import("std");
+
+// =============================================================================
+// Model Structs (FFI-safe with fixed-size buffers)
+// =============================================================================
+
+/// Track/Library model - represents a music file in the library
+pub const Track = extern struct {
+    id: i64,
+    filepath: [4096]u8,
+    filepath_len: u32,
+    title: [512]u8,
+    title_len: u32,
+    artist: [512]u8,
+    artist_len: u32,
+    album: [512]u8,
+    album_len: u32,
+    album_artist: [512]u8,
+    album_artist_len: u32,
+    track_number: [32]u8,
+    track_number_len: u32,
+    track_total: [32]u8,
+    track_total_len: u32,
+    date: [32]u8,
+    date_len: u32,
+    genre: [256]u8,
+    genre_len: u32,
+    duration_secs: f64,
+    file_size: i64,
+    file_mtime_ns: i64,
+    file_inode: i64,
+    content_hash: [64]u8, // SHA256 hex
+    content_hash_len: u32,
+    added_date: i64,
+    last_played: i64,
+    play_count: u32,
+    lastfm_loved: bool,
+    missing: bool,
+    last_seen_at: i64,
+
+    /// Initialize an empty track
+    pub fn init() Track {
+        var track = Track{
+            .id = 0,
+            .filepath = undefined,
+            .filepath_len = 0,
+            .title = undefined,
+            .title_len = 0,
+            .artist = undefined,
+            .artist_len = 0,
+            .album = undefined,
+            .album_len = 0,
+            .album_artist = undefined,
+            .album_artist_len = 0,
+            .track_number = undefined,
+            .track_number_len = 0,
+            .track_total = undefined,
+            .track_total_len = 0,
+            .date = undefined,
+            .date_len = 0,
+            .genre = undefined,
+            .genre_len = 0,
+            .duration_secs = 0.0,
+            .file_size = 0,
+            .file_mtime_ns = 0,
+            .file_inode = 0,
+            .content_hash = undefined,
+            .content_hash_len = 0,
+            .added_date = 0,
+            .last_played = 0,
+            .play_count = 0,
+            .lastfm_loved = false,
+            .missing = false,
+            .last_seen_at = 0,
+        };
+        @memset(&track.filepath, 0);
+        @memset(&track.title, 0);
+        @memset(&track.artist, 0);
+        @memset(&track.album, 0);
+        @memset(&track.album_artist, 0);
+        @memset(&track.track_number, 0);
+        @memset(&track.track_total, 0);
+        @memset(&track.date, 0);
+        @memset(&track.genre, 0);
+        @memset(&track.content_hash, 0);
+        return track;
+    }
+
+    /// Get filepath as slice
+    pub fn getFilepath(self: *const Track) []const u8 {
+        return self.filepath[0..self.filepath_len];
+    }
+
+    /// Get title as slice
+    pub fn getTitle(self: *const Track) []const u8 {
+        return self.title[0..self.title_len];
+    }
+
+    /// Get artist as slice
+    pub fn getArtist(self: *const Track) []const u8 {
+        return self.artist[0..self.artist_len];
+    }
+
+    /// Get album as slice
+    pub fn getAlbum(self: *const Track) []const u8 {
+        return self.album[0..self.album_len];
+    }
+
+    /// Set filepath
+    pub fn setFilepath(self: *Track, path: []const u8) void {
+        const len = @min(path.len, self.filepath.len);
+        @memcpy(self.filepath[0..len], path[0..len]);
+        self.filepath_len = @intCast(len);
+    }
+
+    /// Set title
+    pub fn setTitle(self: *Track, value: []const u8) void {
+        const len = @min(value.len, self.title.len);
+        @memcpy(self.title[0..len], value[0..len]);
+        self.title_len = @intCast(len);
+    }
+
+    /// Set artist
+    pub fn setArtist(self: *Track, value: []const u8) void {
+        const len = @min(value.len, self.artist.len);
+        @memcpy(self.artist[0..len], value[0..len]);
+        self.artist_len = @intCast(len);
+    }
+
+    /// Set album
+    pub fn setAlbum(self: *Track, value: []const u8) void {
+        const len = @min(value.len, self.album.len);
+        @memcpy(self.album[0..len], value[0..len]);
+        self.album_len = @intCast(len);
+    }
+};
+
+/// Playlist model
+pub const Playlist = extern struct {
+    id: i64,
+    name: [512]u8,
+    name_len: u32,
+    position: u32,
+    created_at: i64,
+
+    /// Initialize an empty playlist
+    pub fn init() Playlist {
+        var playlist = Playlist{
+            .id = 0,
+            .name = undefined,
+            .name_len = 0,
+            .position = 0,
+            .created_at = 0,
+        };
+        @memset(&playlist.name, 0);
+        return playlist;
+    }
+
+    /// Get name as slice
+    pub fn getName(self: *const Playlist) []const u8 {
+        return self.name[0..self.name_len];
+    }
+
+    /// Set name
+    pub fn setName(self: *Playlist, value: []const u8) void {
+        const len = @min(value.len, self.name.len);
+        @memcpy(self.name[0..len], value[0..len]);
+        self.name_len = @intCast(len);
+    }
+};
+
+/// Playlist item model (track in a playlist)
+pub const PlaylistItem = extern struct {
+    id: i64,
+    playlist_id: i64,
+    track_id: i64,
+    position: u32,
+    added_at: i64,
+};
+
+/// Queue item model (track in the play queue)
+pub const QueueItem = extern struct {
+    id: i64,
+    filepath: [4096]u8,
+    filepath_len: u32,
+
+    /// Initialize an empty queue item
+    pub fn init() QueueItem {
+        var item = QueueItem{
+            .id = 0,
+            .filepath = undefined,
+            .filepath_len = 0,
+        };
+        @memset(&item.filepath, 0);
+        return item;
+    }
+
+    /// Get filepath as slice
+    pub fn getFilepath(self: *const QueueItem) []const u8 {
+        return self.filepath[0..self.filepath_len];
+    }
+
+    /// Set filepath
+    pub fn setFilepath(self: *QueueItem, path: []const u8) void {
+        const len = @min(path.len, self.filepath.len);
+        @memcpy(self.filepath[0..len], path[0..len]);
+        self.filepath_len = @intCast(len);
+    }
+};
+
+/// Queue state model (singleton - stores playback state)
+pub const QueueState = extern struct {
+    current_index: i32,
+    shuffle_enabled: bool,
+    loop_mode: [16]u8,
+    loop_mode_len: u32,
+    original_order_json: [65536]u8, // Large buffer for JSON array
+    original_order_json_len: u32,
+
+    /// Initialize default queue state
+    pub fn init() QueueState {
+        var state = QueueState{
+            .current_index = -1,
+            .shuffle_enabled = false,
+            .loop_mode = undefined,
+            .loop_mode_len = 4,
+            .original_order_json = undefined,
+            .original_order_json_len = 0,
+        };
+        @memset(&state.loop_mode, 0);
+        @memcpy(state.loop_mode[0..4], "none");
+        @memset(&state.original_order_json, 0);
+        return state;
+    }
+
+    /// Get loop mode as slice
+    pub fn getLoopMode(self: *const QueueState) []const u8 {
+        return self.loop_mode[0..self.loop_mode_len];
+    }
+};
+
+/// Setting model (key-value store)
+pub const Setting = extern struct {
+    key: [256]u8,
+    key_len: u32,
+    value: [4096]u8,
+    value_len: u32,
+
+    /// Initialize an empty setting
+    pub fn init() Setting {
+        var setting = Setting{
+            .key = undefined,
+            .key_len = 0,
+            .value = undefined,
+            .value_len = 0,
+        };
+        @memset(&setting.key, 0);
+        @memset(&setting.value, 0);
+        return setting;
+    }
+
+    /// Get key as slice
+    pub fn getKey(self: *const Setting) []const u8 {
+        return self.key[0..self.key_len];
+    }
+
+    /// Get value as slice
+    pub fn getValue(self: *const Setting) []const u8 {
+        return self.value[0..self.value_len];
+    }
+};
+
+/// Favorite model
+pub const Favorite = extern struct {
+    id: i64,
+    track_id: i64,
+    timestamp: i64,
+};
+
+/// Lyrics cache model
+pub const LyricsCache = extern struct {
+    id: i64,
+    artist: [512]u8,
+    artist_len: u32,
+    title: [512]u8,
+    title_len: u32,
+    album: [512]u8,
+    album_len: u32,
+    lyrics: [65536]u8, // Large buffer for lyrics text
+    lyrics_len: u32,
+    source_url: [2048]u8,
+    source_url_len: u32,
+    fetched_at: i64,
+
+    /// Initialize an empty lyrics cache entry
+    pub fn init() LyricsCache {
+        var cache = LyricsCache{
+            .id = 0,
+            .artist = undefined,
+            .artist_len = 0,
+            .title = undefined,
+            .title_len = 0,
+            .album = undefined,
+            .album_len = 0,
+            .lyrics = undefined,
+            .lyrics_len = 0,
+            .source_url = undefined,
+            .source_url_len = 0,
+            .fetched_at = 0,
+        };
+        @memset(&cache.artist, 0);
+        @memset(&cache.title, 0);
+        @memset(&cache.album, 0);
+        @memset(&cache.lyrics, 0);
+        @memset(&cache.source_url, 0);
+        return cache;
+    }
+};
+
+/// Scrobble queue entry (for offline scrobbling)
+pub const ScrobbleEntry = extern struct {
+    id: i64,
+    artist: [512]u8,
+    artist_len: u32,
+    track: [512]u8,
+    track_len: u32,
+    album: [512]u8,
+    album_len: u32,
+    timestamp: i64,
+    created_at: i64,
+    retry_count: u32,
+
+    /// Initialize an empty scrobble entry
+    pub fn init() ScrobbleEntry {
+        var entry = ScrobbleEntry{
+            .id = 0,
+            .artist = undefined,
+            .artist_len = 0,
+            .track = undefined,
+            .track_len = 0,
+            .album = undefined,
+            .album_len = 0,
+            .timestamp = 0,
+            .created_at = 0,
+            .retry_count = 0,
+        };
+        @memset(&entry.artist, 0);
+        @memset(&entry.track, 0);
+        @memset(&entry.album, 0);
+        return entry;
+    }
+};
+
+/// Watched folder model
+pub const WatchedFolder = extern struct {
+    id: i64,
+    path: [4096]u8,
+    path_len: u32,
+    mode: [32]u8, // "startup", "realtime", "manual"
+    mode_len: u32,
+    cadence_minutes: u32,
+    enabled: bool,
+    last_scanned_at: i64,
+    created_at: i64,
+    updated_at: i64,
+
+    /// Initialize an empty watched folder
+    pub fn init() WatchedFolder {
+        var folder = WatchedFolder{
+            .id = 0,
+            .path = undefined,
+            .path_len = 0,
+            .mode = undefined,
+            .mode_len = 7,
+            .cadence_minutes = 10,
+            .enabled = true,
+            .last_scanned_at = 0,
+            .created_at = 0,
+            .updated_at = 0,
+        };
+        @memset(&folder.path, 0);
+        @memset(&folder.mode, 0);
+        @memcpy(folder.mode[0..7], "startup");
+        return folder;
+    }
+
+    /// Get path as slice
+    pub fn getPath(self: *const WatchedFolder) []const u8 {
+        return self.path[0..self.path_len];
+    }
+
+    /// Get mode as slice
+    pub fn getMode(self: *const WatchedFolder) []const u8 {
+        return self.mode[0..self.mode_len];
+    }
+};
+
+// =============================================================================
+// Schema Definitions
+// =============================================================================
+
+/// Schema version for migrations
+pub const SCHEMA_VERSION: u32 = 1;
+
+/// SQL schema definitions matching Rust's CREATE_TABLES exactly
+pub const SCHEMA_SQL = struct {
+    /// Queue table - simple filepath-based queue
+    pub const queue_table =
+        \\CREATE TABLE IF NOT EXISTS queue (
+        \\    id INTEGER PRIMARY KEY AUTOINCREMENT,
+        \\    filepath TEXT NOT NULL
+        \\);
+    ;
+
+    /// Library table - main track storage
+    pub const library_table =
+        \\CREATE TABLE IF NOT EXISTS library (
+        \\    id INTEGER PRIMARY KEY AUTOINCREMENT,
+        \\    filepath TEXT NOT NULL,
+        \\    title TEXT,
+        \\    artist TEXT,
+        \\    album TEXT,
+        \\    album_artist TEXT,
+        \\    track_number TEXT,
+        \\    track_total TEXT,
+        \\    date TEXT,
+        \\    duration REAL,
+        \\    file_size INTEGER DEFAULT 0,
+        \\    file_mtime_ns INTEGER,
+        \\    added_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        \\    last_played TIMESTAMP,
+        \\    play_count INTEGER DEFAULT 0
+        \\);
+    ;
+
+    /// Settings table - key-value store
+    pub const settings_table =
+        \\CREATE TABLE IF NOT EXISTS settings (
+        \\    key TEXT PRIMARY KEY,
+        \\    value TEXT
+        \\);
+    ;
+
+    /// Favorites table - track favorites
+    pub const favorites_table =
+        \\CREATE TABLE IF NOT EXISTS favorites (
+        \\    id INTEGER PRIMARY KEY AUTOINCREMENT,
+        \\    track_id INTEGER NOT NULL,
+        \\    timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        \\    FOREIGN KEY (track_id) REFERENCES library(id),
+        \\    UNIQUE(track_id)
+        \\);
+    ;
+
+    /// Lyrics cache table
+    pub const lyrics_cache_table =
+        \\CREATE TABLE IF NOT EXISTS lyrics_cache (
+        \\    id INTEGER PRIMARY KEY AUTOINCREMENT,
+        \\    artist TEXT NOT NULL,
+        \\    title TEXT NOT NULL,
+        \\    album TEXT,
+        \\    lyrics TEXT,
+        \\    source_url TEXT,
+        \\    fetched_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        \\    UNIQUE(artist, title)
+        \\);
+    ;
+
+    /// Playlists table
+    pub const playlists_table =
+        \\CREATE TABLE IF NOT EXISTS playlists (
+        \\    id INTEGER PRIMARY KEY AUTOINCREMENT,
+        \\    name TEXT NOT NULL UNIQUE,
+        \\    position INTEGER DEFAULT 0,
+        \\    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+        \\);
+    ;
+
+    /// Playlist items table
+    pub const playlist_items_table =
+        \\CREATE TABLE IF NOT EXISTS playlist_items (
+        \\    id INTEGER PRIMARY KEY AUTOINCREMENT,
+        \\    playlist_id INTEGER NOT NULL,
+        \\    track_id INTEGER NOT NULL,
+        \\    position INTEGER NOT NULL,
+        \\    added_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        \\    UNIQUE(playlist_id, track_id),
+        \\    FOREIGN KEY (playlist_id) REFERENCES playlists(id) ON DELETE CASCADE,
+        \\    FOREIGN KEY (track_id) REFERENCES library(id) ON DELETE CASCADE
+        \\);
+    ;
+
+    /// Scrobble queue table
+    pub const scrobble_queue_table =
+        \\CREATE TABLE IF NOT EXISTS scrobble_queue (
+        \\    id INTEGER PRIMARY KEY AUTOINCREMENT,
+        \\    artist TEXT NOT NULL,
+        \\    track TEXT NOT NULL,
+        \\    album TEXT,
+        \\    timestamp INTEGER NOT NULL,
+        \\    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        \\    retry_count INTEGER DEFAULT 0
+        \\);
+    ;
+
+    /// Watched folders table
+    pub const watched_folders_table =
+        \\CREATE TABLE IF NOT EXISTS watched_folders (
+        \\    id INTEGER PRIMARY KEY AUTOINCREMENT,
+        \\    path TEXT NOT NULL UNIQUE,
+        \\    mode TEXT NOT NULL DEFAULT 'startup',
+        \\    cadence_minutes INTEGER DEFAULT 10,
+        \\    enabled INTEGER NOT NULL DEFAULT 1,
+        \\    last_scanned_at INTEGER,
+        \\    created_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
+        \\    updated_at INTEGER NOT NULL DEFAULT (strftime('%s','now'))
+        \\);
+    ;
+
+    /// Queue state table (singleton)
+    pub const queue_state_table =
+        \\CREATE TABLE IF NOT EXISTS queue_state (
+        \\    id INTEGER PRIMARY KEY CHECK (id = 1),
+        \\    current_index INTEGER DEFAULT -1,
+        \\    shuffle_enabled INTEGER DEFAULT 0,
+        \\    loop_mode TEXT DEFAULT 'none',
+        \\    original_order_json TEXT
+        \\);
+    ;
+
+    /// All table schemas in order
+    pub const all_tables = [_][]const u8{
+        queue_table,
+        library_table,
+        settings_table,
+        favorites_table,
+        lyrics_cache_table,
+        playlists_table,
+        playlist_items_table,
+        scrobble_queue_table,
+        watched_folders_table,
+        queue_state_table,
+    };
+
+    /// Index creation statements
+    pub const indices = struct {
+        pub const library_filepath =
+            \\CREATE INDEX IF NOT EXISTS idx_library_filepath ON library(filepath);
+        ;
+        pub const library_file_inode =
+            \\CREATE INDEX IF NOT EXISTS idx_library_file_inode ON library(file_inode) WHERE file_inode IS NOT NULL;
+        ;
+        pub const library_content_hash =
+            \\CREATE INDEX IF NOT EXISTS idx_library_content_hash ON library(content_hash) WHERE content_hash IS NOT NULL;
+        ;
+    };
+
+    /// Migration SQL for adding columns
+    pub const migrations = struct {
+        pub const add_file_size = "ALTER TABLE library ADD COLUMN file_size INTEGER DEFAULT 0";
+        pub const add_file_mtime_ns = "ALTER TABLE library ADD COLUMN file_mtime_ns INTEGER";
+        pub const add_lastfm_loved = "ALTER TABLE library ADD COLUMN lastfm_loved BOOLEAN DEFAULT FALSE";
+        pub const add_missing = "ALTER TABLE library ADD COLUMN missing INTEGER DEFAULT 0";
+        pub const add_last_seen_at = "ALTER TABLE library ADD COLUMN last_seen_at INTEGER";
+        pub const add_file_inode = "ALTER TABLE library ADD COLUMN file_inode INTEGER";
+        pub const add_content_hash = "ALTER TABLE library ADD COLUMN content_hash TEXT";
+        pub const add_playlist_position = "ALTER TABLE playlists ADD COLUMN position INTEGER DEFAULT 0";
+    };
+};
+
+// =============================================================================
+// Tests
+// =============================================================================
+
+test "Track struct initialization" {
+    const track = Track.init();
+    try std.testing.expectEqual(@as(i64, 0), track.id);
+    try std.testing.expectEqual(@as(u32, 0), track.filepath_len);
+    try std.testing.expectEqual(@as(u32, 0), track.title_len);
+    try std.testing.expectEqual(@as(f64, 0.0), track.duration_secs);
+    try std.testing.expect(!track.missing);
+    try std.testing.expect(!track.lastfm_loved);
+}
+
+test "Track setters and getters" {
+    var track = Track.init();
+
+    track.setFilepath("/music/test.mp3");
+    try std.testing.expectEqualStrings("/music/test.mp3", track.getFilepath());
+
+    track.setTitle("Test Song");
+    try std.testing.expectEqualStrings("Test Song", track.getTitle());
+
+    track.setArtist("Test Artist");
+    try std.testing.expectEqualStrings("Test Artist", track.getArtist());
+
+    track.setAlbum("Test Album");
+    try std.testing.expectEqualStrings("Test Album", track.getAlbum());
+}
+
+test "Playlist initialization and setters" {
+    var playlist = Playlist.init();
+    try std.testing.expectEqual(@as(i64, 0), playlist.id);
+    try std.testing.expectEqual(@as(u32, 0), playlist.position);
+
+    playlist.setName("My Playlist");
+    try std.testing.expectEqualStrings("My Playlist", playlist.getName());
+}
+
+test "QueueItem initialization" {
+    var item = QueueItem.init();
+    try std.testing.expectEqual(@as(i64, 0), item.id);
+
+    item.setFilepath("/music/song.flac");
+    try std.testing.expectEqualStrings("/music/song.flac", item.getFilepath());
+}
+
+test "QueueState initialization" {
+    const state = QueueState.init();
+    try std.testing.expectEqual(@as(i32, -1), state.current_index);
+    try std.testing.expect(!state.shuffle_enabled);
+    try std.testing.expectEqualStrings("none", state.getLoopMode());
+}
+
+test "Setting initialization" {
+    const setting = Setting.init();
+    try std.testing.expectEqual(@as(u32, 0), setting.key_len);
+    try std.testing.expectEqual(@as(u32, 0), setting.value_len);
+}
+
+test "WatchedFolder initialization" {
+    const folder = WatchedFolder.init();
+    try std.testing.expect(folder.enabled);
+    try std.testing.expectEqual(@as(u32, 10), folder.cadence_minutes);
+    try std.testing.expectEqualStrings("startup", folder.getMode());
+}
+
+test "ScrobbleEntry initialization" {
+    const entry = ScrobbleEntry.init();
+    try std.testing.expectEqual(@as(i64, 0), entry.id);
+    try std.testing.expectEqual(@as(u32, 0), entry.retry_count);
+}
+
+test "Schema SQL table count" {
+    // Should have exactly 10 tables matching Rust
+    try std.testing.expectEqual(@as(usize, 10), SCHEMA_SQL.all_tables.len);
+}
+
+test "Schema SQL validity - basic syntax check" {
+    // Verify all SQL strings contain expected keywords
+    for (SCHEMA_SQL.all_tables) |sql| {
+        try std.testing.expect(std.mem.indexOf(u8, sql, "CREATE TABLE") != null);
+        try std.testing.expect(std.mem.indexOf(u8, sql, "IF NOT EXISTS") != null);
+    }
+}
+
+test "Track struct size is reasonable for FFI" {
+    // Track should be large but under 64KB for stack allocation
+    const size = @sizeOf(Track);
+    try std.testing.expect(size < 65536);
+    try std.testing.expect(size > 1000); // Should be reasonably large
+}
+
+test "LyricsCache struct initialization" {
+    const cache = LyricsCache.init();
+    try std.testing.expectEqual(@as(i64, 0), cache.id);
+    try std.testing.expectEqual(@as(u32, 0), cache.artist_len);
+    try std.testing.expectEqual(@as(u32, 0), cache.lyrics_len);
+}
diff --git a/zig-core/src/db/queue.zig b/zig-core/src/db/queue.zig
new file mode 100644
index 0000000..6b49c95
--- /dev/null
+++ b/zig-core/src/db/queue.zig
@@ -0,0 +1,497 @@
+//! Queue database operations.
+//!
+//! Manages playback queue, playlists, and favorites.
+//! Actual SQLite operations are handled by Rust via FFI - this module
+//! provides types and interfaces for cross-language communication.
+
+const std = @import("std");
+const models = @import("models.zig");
+const Allocator = std.mem.Allocator;
+
+// =============================================================================
+// Queue Item Types (FFI-safe)
+// =============================================================================
+
+/// Queue item with track reference
+pub const QueueItemFull = extern struct {
+    id: i64,
+    track_id: i64,
+    position: u32,
+    is_current: bool,
+    added_at: i64, // Unix timestamp
+
+    pub fn init() QueueItemFull {
+        return QueueItemFull{
+            .id = 0,
+            .track_id = 0,
+            .position = 0,
+            .is_current = false,
+            .added_at = 0,
+        };
+    }
+};
+
+/// Queue state snapshot
+pub const QueueSnapshot = extern struct {
+    current_position: u32,
+    total_items: u32,
+    shuffle_enabled: bool,
+    repeat_mode: RepeatMode,
+    current_track_id: i64,
+
+    pub const RepeatMode = enum(u8) {
+        off = 0,
+        one = 1,
+        all = 2,
+    };
+
+    pub fn init() QueueSnapshot {
+        return QueueSnapshot{
+            .current_position = 0,
+            .total_items = 0,
+            .shuffle_enabled = false,
+            .repeat_mode = .off,
+            .current_track_id = 0,
+        };
+    }
+};
+
+// =============================================================================
+// Queue Results (FFI-safe)
+// =============================================================================
+
+/// Result of queue query
+pub const QueueQueryResult = extern struct {
+    items_ptr: ?[*]QueueItemFull,
+    count: u32,
+    error_code: u32,
+
+    pub fn initSuccess(items: []QueueItemFull) QueueQueryResult {
+        return QueueQueryResult{
+            .items_ptr = if (items.len > 0) items.ptr else null,
+            .count = @intCast(items.len),
+            .error_code = 0,
+        };
+    }
+
+    pub fn initEmpty() QueueQueryResult {
+        return QueueQueryResult{
+            .items_ptr = null,
+            .count = 0,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initError(code: u32) QueueQueryResult {
+        return QueueQueryResult{
+            .items_ptr = null,
+            .count = 0,
+            .error_code = code,
+        };
+    }
+
+    pub fn isSuccess(self: *const QueueQueryResult) bool {
+        return self.error_code == 0;
+    }
+
+    pub fn getItems(self: *const QueueQueryResult) []QueueItemFull {
+        if (self.items_ptr) |ptr| {
+            return ptr[0..self.count];
+        }
+        return &[_]QueueItemFull{};
+    }
+};
+
+// =============================================================================
+// Playlist Types (FFI-safe)
+// =============================================================================
+
+/// Playlist metadata
+pub const PlaylistInfo = extern struct {
+    id: i64,
+    name: [256]u8,
+    name_len: u32,
+    track_count: u32,
+    total_duration: i64, // Total duration in seconds
+    created_at: i64,
+    updated_at: i64,
+
+    pub fn init() PlaylistInfo {
+        var info = PlaylistInfo{
+            .id = 0,
+            .name = undefined,
+            .name_len = 0,
+            .track_count = 0,
+            .total_duration = 0,
+            .created_at = 0,
+            .updated_at = 0,
+        };
+        @memset(&info.name, 0);
+        return info;
+    }
+
+    pub fn getName(self: *const PlaylistInfo) []const u8 {
+        return self.name[0..self.name_len];
+    }
+
+    pub fn setName(self: *PlaylistInfo, n: []const u8) void {
+        const len = @min(n.len, self.name.len);
+        @memcpy(self.name[0..len], n[0..len]);
+        self.name_len = @intCast(len);
+    }
+};
+
+/// Playlist query result
+pub const PlaylistQueryResult = extern struct {
+    playlists_ptr: ?[*]PlaylistInfo,
+    count: u32,
+    error_code: u32,
+
+    pub fn initSuccess(playlists: []PlaylistInfo) PlaylistQueryResult {
+        return PlaylistQueryResult{
+            .playlists_ptr = if (playlists.len > 0) playlists.ptr else null,
+            .count = @intCast(playlists.len),
+            .error_code = 0,
+        };
+    }
+
+    pub fn initEmpty() PlaylistQueryResult {
+        return PlaylistQueryResult{
+            .playlists_ptr = null,
+            .count = 0,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initError(code: u32) PlaylistQueryResult {
+        return PlaylistQueryResult{
+            .playlists_ptr = null,
+            .count = 0,
+            .error_code = code,
+        };
+    }
+
+    pub fn isSuccess(self: *const PlaylistQueryResult) bool {
+        return self.error_code == 0;
+    }
+
+    pub fn getPlaylists(self: *const PlaylistQueryResult) []PlaylistInfo {
+        if (self.playlists_ptr) |ptr| {
+            return ptr[0..self.count];
+        }
+        return &[_]PlaylistInfo{};
+    }
+};
+
+// =============================================================================
+// Queue Manager
+// =============================================================================
+
+/// Queue manager - handles queue operations
+pub const QueueManager = struct {
+    allocator: Allocator,
+    state: QueueSnapshot,
+
+    pub fn init(allocator: Allocator) QueueManager {
+        return QueueManager{
+            .allocator = allocator,
+            .state = QueueSnapshot.init(),
+        };
+    }
+
+    /// Calculate new positions when moving an item
+    pub fn calculateMovePositions(
+        self: *QueueManager,
+        from_pos: u32,
+        to_pos: u32,
+        total_items: u32,
+    ) MoveResult {
+        _ = self;
+
+        if (from_pos >= total_items or to_pos >= total_items) {
+            return MoveResult.initError(1); // Invalid position
+        }
+
+        if (from_pos == to_pos) {
+            return MoveResult.initNoOp();
+        }
+
+        return MoveResult{
+            .from_position = from_pos,
+            .to_position = to_pos,
+            .shift_start = @min(from_pos, to_pos),
+            .shift_end = @max(from_pos, to_pos),
+            .shift_direction = if (from_pos < to_pos) .down else .up,
+            .error_code = 0,
+        };
+    }
+
+    /// Build shuffle order using Fisher-Yates algorithm
+    pub fn buildShuffleOrder(
+        self: *QueueManager,
+        count: u32,
+        current_position: u32,
+        random_seed: u64,
+    ) ![]u32 {
+        if (count == 0) {
+            return &[_]u32{};
+        }
+
+        var order = try self.allocator.alloc(u32, count);
+        errdefer self.allocator.free(order);
+
+        // Initialize with sequential positions
+        for (0..count) |i| {
+            order[i] = @intCast(i);
+        }
+
+        // Keep current at position 0, shuffle the rest
+        if (current_position < count) {
+            std.mem.swap(u32, &order[0], &order[current_position]);
+        }
+
+        // Fisher-Yates shuffle starting from index 1
+        var rng = std.Random.DefaultPrng.init(random_seed);
+        const random = rng.random();
+
+        var i: u32 = count - 1;
+        while (i > 1) : (i -= 1) {
+            const j = random.intRangeAtMost(u32, 1, i);
+            std.mem.swap(u32, &order[i], &order[j]);
+        }
+
+        return order;
+    }
+};
+
+pub const MoveResult = struct {
+    from_position: u32,
+    to_position: u32,
+    shift_start: u32,
+    shift_end: u32,
+    shift_direction: ShiftDirection,
+    error_code: u32,
+
+    pub const ShiftDirection = enum(u8) {
+        none = 0,
+        up = 1, // Positions decrease
+        down = 2, // Positions increase
+    };
+
+    pub fn initNoOp() MoveResult {
+        return MoveResult{
+            .from_position = 0,
+            .to_position = 0,
+            .shift_start = 0,
+            .shift_end = 0,
+            .shift_direction = .none,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initError(code: u32) MoveResult {
+        return MoveResult{
+            .from_position = 0,
+            .to_position = 0,
+            .shift_start = 0,
+            .shift_end = 0,
+            .shift_direction = .none,
+            .error_code = code,
+        };
+    }
+
+    pub fn isSuccess(self: *const MoveResult) bool {
+        return self.error_code == 0;
+    }
+};
+
+// =============================================================================
+// Favorites Types (FFI-safe)
+// =============================================================================
+
+/// Favorite entry
+pub const FavoriteEntry = extern struct {
+    id: i64,
+    track_id: i64,
+    added_at: i64,
+
+    pub fn init() FavoriteEntry {
+        return FavoriteEntry{
+            .id = 0,
+            .track_id = 0,
+            .added_at = 0,
+        };
+    }
+};
+
+/// Favorites query result
+pub const FavoritesQueryResult = extern struct {
+    favorites_ptr: ?[*]FavoriteEntry,
+    count: u32,
+    error_code: u32,
+
+    pub fn initSuccess(favorites: []FavoriteEntry) FavoritesQueryResult {
+        return FavoritesQueryResult{
+            .favorites_ptr = if (favorites.len > 0) favorites.ptr else null,
+            .count = @intCast(favorites.len),
+            .error_code = 0,
+        };
+    }
+
+    pub fn initEmpty() FavoritesQueryResult {
+        return FavoritesQueryResult{
+            .favorites_ptr = null,
+            .count = 0,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initError(code: u32) FavoritesQueryResult {
+        return FavoritesQueryResult{
+            .favorites_ptr = null,
+            .count = 0,
+            .error_code = code,
+        };
+    }
+
+    pub fn isSuccess(self: *const FavoritesQueryResult) bool {
+        return self.error_code == 0;
+    }
+};
+
+// =============================================================================
+// Tests
+// =============================================================================
+
+test "QueueItemFull initialization" {
+    const item = QueueItemFull.init();
+    try std.testing.expectEqual(@as(i64, 0), item.id);
+    try std.testing.expectEqual(@as(u32, 0), item.position);
+    try std.testing.expect(!item.is_current);
+}
+
+test "QueueSnapshot initialization" {
+    const snapshot = QueueSnapshot.init();
+    try std.testing.expectEqual(@as(u32, 0), snapshot.current_position);
+    try std.testing.expect(!snapshot.shuffle_enabled);
+    try std.testing.expectEqual(QueueSnapshot.RepeatMode.off, snapshot.repeat_mode);
+}
+
+test "QueueQueryResult success" {
+    var items: [3]QueueItemFull = undefined;
+    for (0..3) |i| {
+        items[i] = QueueItemFull.init();
+        items[i].position = @intCast(i);
+    }
+
+    const result = QueueQueryResult.initSuccess(&items);
+    try std.testing.expect(result.isSuccess());
+    try std.testing.expectEqual(@as(u32, 3), result.count);
+}
+
+test "QueueQueryResult empty" {
+    const result = QueueQueryResult.initEmpty();
+    try std.testing.expect(result.isSuccess());
+    try std.testing.expectEqual(@as(u32, 0), result.count);
+}
+
+test "PlaylistInfo initialization" {
+    const info = PlaylistInfo.init();
+    try std.testing.expectEqual(@as(u32, 0), info.name_len);
+    try std.testing.expectEqual(@as(u32, 0), info.track_count);
+}
+
+test "PlaylistInfo setName" {
+    var info = PlaylistInfo.init();
+    info.setName("My Playlist");
+    try std.testing.expectEqualStrings("My Playlist", info.getName());
+}
+
+test "PlaylistQueryResult success" {
+    var playlists: [2]PlaylistInfo = undefined;
+    playlists[0] = PlaylistInfo.init();
+    playlists[0].setName("Playlist 1");
+    playlists[1] = PlaylistInfo.init();
+    playlists[1].setName("Playlist 2");
+
+    const result = PlaylistQueryResult.initSuccess(&playlists);
+    try std.testing.expect(result.isSuccess());
+    try std.testing.expectEqual(@as(u32, 2), result.count);
+}
+
+test "QueueManager calculateMovePositions same position" {
+    const allocator = std.testing.allocator;
+    var manager = QueueManager.init(allocator);
+
+    const result = manager.calculateMovePositions(3, 3, 10);
+    try std.testing.expect(result.isSuccess());
+    try std.testing.expectEqual(MoveResult.ShiftDirection.none, result.shift_direction);
+}
+
+test "QueueManager calculateMovePositions forward" {
+    const allocator = std.testing.allocator;
+    var manager = QueueManager.init(allocator);
+
+    const result = manager.calculateMovePositions(2, 5, 10);
+    try std.testing.expect(result.isSuccess());
+    try std.testing.expectEqual(@as(u32, 2), result.shift_start);
+    try std.testing.expectEqual(@as(u32, 5), result.shift_end);
+    try std.testing.expectEqual(MoveResult.ShiftDirection.down, result.shift_direction);
+}
+
+test "QueueManager calculateMovePositions backward" {
+    const allocator = std.testing.allocator;
+    var manager = QueueManager.init(allocator);
+
+    const result = manager.calculateMovePositions(7, 3, 10);
+    try std.testing.expect(result.isSuccess());
+    try std.testing.expectEqual(@as(u32, 3), result.shift_start);
+    try std.testing.expectEqual(@as(u32, 7), result.shift_end);
+    try std.testing.expectEqual(MoveResult.ShiftDirection.up, result.shift_direction);
+}
+
+test "QueueManager calculateMovePositions invalid" {
+    const allocator = std.testing.allocator;
+    var manager = QueueManager.init(allocator);
+
+    const result = manager.calculateMovePositions(15, 3, 10);
+    try std.testing.expect(!result.isSuccess());
+}
+
+test "QueueManager buildShuffleOrder" {
+    const allocator = std.testing.allocator;
+    var manager = QueueManager.init(allocator);
+
+    const order = try manager.buildShuffleOrder(5, 2, 12345);
+    defer allocator.free(order);
+
+    // Current position (2) should be at index 0 after shuffle
+    try std.testing.expectEqual(@as(u32, 2), order[0]);
+
+    // All positions should be present
+    var seen = [_]bool{false} ** 5;
+    for (order) |pos| {
+        seen[pos] = true;
+    }
+    for (seen) |s| {
+        try std.testing.expect(s);
+    }
+}
+
+test "FavoriteEntry initialization" {
+    const entry = FavoriteEntry.init();
+    try std.testing.expectEqual(@as(i64, 0), entry.id);
+    try std.testing.expectEqual(@as(i64, 0), entry.track_id);
+}
+
+test "FavoritesQueryResult success" {
+    var favorites: [2]FavoriteEntry = undefined;
+    favorites[0] = FavoriteEntry.init();
+    favorites[0].track_id = 100;
+    favorites[1] = FavoriteEntry.init();
+    favorites[1].track_id = 200;
+
+    const result = FavoritesQueryResult.initSuccess(&favorites);
+    try std.testing.expect(result.isSuccess());
+    try std.testing.expectEqual(@as(u32, 2), result.count);
+}
diff --git a/zig-core/src/db/settings.zig b/zig-core/src/db/settings.zig
new file mode 100644
index 0000000..9247186
--- /dev/null
+++ b/zig-core/src/db/settings.zig
@@ -0,0 +1,542 @@
+//! Settings, scrobble tracking, and watched folders database operations.
+//!
+//! Actual SQLite operations are handled by Rust via FFI - this module
+//! provides types and interfaces for cross-language communication.
+
+const std = @import("std");
+const models = @import("models.zig");
+const Allocator = std.mem.Allocator;
+
+// =============================================================================
+// Settings Types (FFI-safe)
+// =============================================================================
+
+/// Setting key-value pair
+pub const SettingEntry = extern struct {
+    key: [128]u8,
+    key_len: u32,
+    value: [4096]u8,
+    value_len: u32,
+
+    pub fn init() SettingEntry {
+        var entry = SettingEntry{
+            .key = undefined,
+            .key_len = 0,
+            .value = undefined,
+            .value_len = 0,
+        };
+        @memset(&entry.key, 0);
+        @memset(&entry.value, 0);
+        return entry;
+    }
+
+    pub fn getKey(self: *const SettingEntry) []const u8 {
+        return self.key[0..self.key_len];
+    }
+
+    pub fn getValue(self: *const SettingEntry) []const u8 {
+        return self.value[0..self.value_len];
+    }
+
+    pub fn setKey(self: *SettingEntry, k: []const u8) void {
+        const len = @min(k.len, self.key.len);
+        @memcpy(self.key[0..len], k[0..len]);
+        self.key_len = @intCast(len);
+    }
+
+    pub fn setValue(self: *SettingEntry, v: []const u8) void {
+        const len = @min(v.len, self.value.len);
+        @memcpy(self.value[0..len], v[0..len]);
+        self.value_len = @intCast(len);
+    }
+};
+
+/// Setting query result
+pub const SettingResult = extern struct {
+    entry: SettingEntry,
+    found: bool,
+    error_code: u32,
+
+    pub fn initFound(key: []const u8, value: []const u8) SettingResult {
+        var entry = SettingEntry.init();
+        entry.setKey(key);
+        entry.setValue(value);
+        return SettingResult{
+            .entry = entry,
+            .found = true,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initNotFound() SettingResult {
+        return SettingResult{
+            .entry = SettingEntry.init(),
+            .found = false,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initError(code: u32) SettingResult {
+        return SettingResult{
+            .entry = SettingEntry.init(),
+            .found = false,
+            .error_code = code,
+        };
+    }
+
+    pub fn isSuccess(self: *const SettingResult) bool {
+        return self.error_code == 0;
+    }
+};
+
+// =============================================================================
+// Common Setting Keys
+// =============================================================================
+
+pub const SettingKeys = struct {
+    pub const volume: []const u8 = "volume";
+    pub const shuffle: []const u8 = "shuffle";
+    pub const repeat_mode: []const u8 = "repeat_mode";
+    pub const lastfm_session: []const u8 = "lastfm_session";
+    pub const lastfm_username: []const u8 = "lastfm_username";
+    pub const theme: []const u8 = "theme";
+    pub const window_width: []const u8 = "window_width";
+    pub const window_height: []const u8 = "window_height";
+    pub const window_x: []const u8 = "window_x";
+    pub const window_y: []const u8 = "window_y";
+    pub const sidebar_width: []const u8 = "sidebar_width";
+    pub const show_artwork: []const u8 = "show_artwork";
+    pub const crossfade_duration: []const u8 = "crossfade_duration";
+    pub const equalizer_preset: []const u8 = "equalizer_preset";
+};
+
+// =============================================================================
+// Scrobble Types (FFI-safe)
+// =============================================================================
+
+/// Scrobble record for tracking plays
+pub const ScrobbleRecord = extern struct {
+    id: i64,
+    track_id: i64,
+    artist: [512]u8,
+    artist_len: u32,
+    track: [512]u8,
+    track_len: u32,
+    album: [512]u8,
+    album_len: u32,
+    timestamp: i64, // Unix timestamp of play
+    duration: i32, // Track duration in seconds
+    submitted: bool, // Whether scrobble was submitted to Last.fm
+
+    pub fn init() ScrobbleRecord {
+        var record = ScrobbleRecord{
+            .id = 0,
+            .track_id = 0,
+            .artist = undefined,
+            .artist_len = 0,
+            .track = undefined,
+            .track_len = 0,
+            .album = undefined,
+            .album_len = 0,
+            .timestamp = 0,
+            .duration = 0,
+            .submitted = false,
+        };
+        @memset(&record.artist, 0);
+        @memset(&record.track, 0);
+        @memset(&record.album, 0);
+        return record;
+    }
+
+    pub fn getArtist(self: *const ScrobbleRecord) []const u8 {
+        return self.artist[0..self.artist_len];
+    }
+
+    pub fn getTrack(self: *const ScrobbleRecord) []const u8 {
+        return self.track[0..self.track_len];
+    }
+
+    pub fn getAlbum(self: *const ScrobbleRecord) []const u8 {
+        return self.album[0..self.album_len];
+    }
+
+    pub fn setArtist(self: *ScrobbleRecord, a: []const u8) void {
+        const len = @min(a.len, self.artist.len);
+        @memcpy(self.artist[0..len], a[0..len]);
+        self.artist_len = @intCast(len);
+    }
+
+    pub fn setTrack(self: *ScrobbleRecord, t: []const u8) void {
+        const len = @min(t.len, self.track.len);
+        @memcpy(self.track[0..len], t[0..len]);
+        self.track_len = @intCast(len);
+    }
+
+    pub fn setAlbum(self: *ScrobbleRecord, a: []const u8) void {
+        const len = @min(a.len, self.album.len);
+        @memcpy(self.album[0..len], a[0..len]);
+        self.album_len = @intCast(len);
+    }
+};
+
+/// Scrobble query result
+pub const ScrobbleQueryResult = extern struct {
+    scrobbles_ptr: ?[*]ScrobbleRecord,
+    count: u32,
+    error_code: u32,
+
+    pub fn initSuccess(scrobbles: []ScrobbleRecord) ScrobbleQueryResult {
+        return ScrobbleQueryResult{
+            .scrobbles_ptr = if (scrobbles.len > 0) scrobbles.ptr else null,
+            .count = @intCast(scrobbles.len),
+            .error_code = 0,
+        };
+    }
+
+    pub fn initEmpty() ScrobbleQueryResult {
+        return ScrobbleQueryResult{
+            .scrobbles_ptr = null,
+            .count = 0,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initError(code: u32) ScrobbleQueryResult {
+        return ScrobbleQueryResult{
+            .scrobbles_ptr = null,
+            .count = 0,
+            .error_code = code,
+        };
+    }
+
+    pub fn isSuccess(self: *const ScrobbleQueryResult) bool {
+        return self.error_code == 0;
+    }
+
+    pub fn getScrobbles(self: *const ScrobbleQueryResult) []ScrobbleRecord {
+        if (self.scrobbles_ptr) |ptr| {
+            return ptr[0..self.count];
+        }
+        return &[_]ScrobbleRecord{};
+    }
+};
+
+// =============================================================================
+// Watched Folder Types (FFI-safe)
+// =============================================================================
+
+/// Scan mode for watched folders
+pub const ScanMode = enum(u8) {
+    manual = 0, // Only scan when explicitly triggered
+    auto = 1, // Scan on application start
+    watch = 2, // Monitor for filesystem changes
+};
+
+/// Watched folder entry
+pub const WatchedFolder = extern struct {
+    id: i64,
+    path: [4096]u8,
+    path_len: u32,
+    scan_mode: u8,
+    enabled: bool,
+    last_scan: i64, // Unix timestamp of last scan
+    track_count: u32, // Number of tracks found
+
+    pub fn init() WatchedFolder {
+        var folder = WatchedFolder{
+            .id = 0,
+            .path = undefined,
+            .path_len = 0,
+            .scan_mode = @intFromEnum(ScanMode.manual),
+            .enabled = true,
+            .last_scan = 0,
+            .track_count = 0,
+        };
+        @memset(&folder.path, 0);
+        return folder;
+    }
+
+    pub fn getPath(self: *const WatchedFolder) []const u8 {
+        return self.path[0..self.path_len];
+    }
+
+    pub fn setPath(self: *WatchedFolder, p: []const u8) void {
+        const len = @min(p.len, self.path.len);
+        @memcpy(self.path[0..len], p[0..len]);
+        self.path_len = @intCast(len);
+    }
+
+    pub fn getScanMode(self: *const WatchedFolder) ScanMode {
+        return @enumFromInt(self.scan_mode);
+    }
+
+    pub fn setScanMode(self: *WatchedFolder, mode: ScanMode) void {
+        self.scan_mode = @intFromEnum(mode);
+    }
+};
+
+/// Watched folder query result
+pub const WatchedFolderResult = extern struct {
+    folders_ptr: ?[*]WatchedFolder,
+    count: u32,
+    error_code: u32,
+
+    pub fn initSuccess(folders: []WatchedFolder) WatchedFolderResult {
+        return WatchedFolderResult{
+            .folders_ptr = if (folders.len > 0) folders.ptr else null,
+            .count = @intCast(folders.len),
+            .error_code = 0,
+        };
+    }
+
+    pub fn initEmpty() WatchedFolderResult {
+        return WatchedFolderResult{
+            .folders_ptr = null,
+            .count = 0,
+            .error_code = 0,
+        };
+    }
+
+    pub fn initError(code: u32) WatchedFolderResult {
+        return WatchedFolderResult{
+            .folders_ptr = null,
+            .count = 0,
+            .error_code = code,
+        };
+    }
+
+    pub fn isSuccess(self: *const WatchedFolderResult) bool {
+        return self.error_code == 0;
+    }
+
+    pub fn getFolders(self: *const WatchedFolderResult) []WatchedFolder {
+        if (self.folders_ptr) |ptr| {
+            return ptr[0..self.count];
+        }
+        return &[_]WatchedFolder{};
+    }
+};
+
+// =============================================================================
+// Settings Manager
+// =============================================================================
+
+/// Settings manager - provides setting value parsing and validation
+pub const SettingsManager = struct {
+    allocator: Allocator,
+
+    pub fn init(allocator: Allocator) SettingsManager {
+        return SettingsManager{
+            .allocator = allocator,
+        };
+    }
+
+    /// Parse boolean setting value
+    pub fn parseBool(value: []const u8) ?bool {
+        if (std.mem.eql(u8, value, "true") or std.mem.eql(u8, value, "1")) {
+            return true;
+        }
+        if (std.mem.eql(u8, value, "false") or std.mem.eql(u8, value, "0")) {
+            return false;
+        }
+        return null;
+    }
+
+    /// Parse integer setting value
+    pub fn parseInt(comptime T: type, value: []const u8) ?T {
+        return std.fmt.parseInt(T, value, 10) catch null;
+    }
+
+    /// Parse float setting value
+    pub fn parseFloat(comptime T: type, value: []const u8) ?T {
+        return std.fmt.parseFloat(T, value) catch null;
+    }
+
+    /// Format boolean as setting value
+    pub fn formatBool(value: bool) []const u8 {
+        return if (value) "true" else "false";
+    }
+
+    /// Format integer as setting value
+    pub fn formatInt(self: *SettingsManager, value: anytype) ![]u8 {
+        var buf: [32]u8 = undefined;
+        const result = std.fmt.bufPrint(&buf, "{d}", .{value}) catch return error.FormatError;
+        return try self.allocator.dupe(u8, result);
+    }
+};
+
+// =============================================================================
+// Scrobble Manager
+// =============================================================================
+
+/// Scrobble manager - validates scrobble eligibility
+pub const ScrobbleManager = struct {
+    /// Minimum play duration for scrobble (4 minutes per Last.fm rules)
+    pub const MIN_SCROBBLE_DURATION: i32 = 240;
+    /// Minimum play percentage for scrobble (50% per Last.fm rules)
+    pub const MIN_SCROBBLE_PERCENTAGE: f32 = 0.5;
+    /// Maximum pending scrobbles to batch submit
+    pub const MAX_BATCH_SIZE: u32 = 50;
+
+    /// Check if a play is eligible for scrobbling
+    pub fn isScrobbleEligible(played_duration: i32, track_duration: i32) bool {
+        // Track must have been played for at least 4 minutes
+        // OR at least 50% of the track, whichever comes first
+        if (track_duration <= 0) return false;
+        if (played_duration <= 0) return false;
+
+        // Check 4-minute rule
+        if (played_duration >= MIN_SCROBBLE_DURATION) return true;
+
+        // Check 50% rule
+        const percentage = @as(f32, @floatFromInt(played_duration)) / @as(f32, @floatFromInt(track_duration));
+        return percentage >= MIN_SCROBBLE_PERCENTAGE;
+    }
+};
+
+// =============================================================================
+// Tests
+// =============================================================================
+
+test "SettingEntry initialization" {
+    const entry = SettingEntry.init();
+    try std.testing.expectEqual(@as(u32, 0), entry.key_len);
+    try std.testing.expectEqual(@as(u32, 0), entry.value_len);
+}
+
+test "SettingEntry setters and getters" {
+    var entry = SettingEntry.init();
+    entry.setKey("volume");
+    entry.setValue("75");
+
+    try std.testing.expectEqualStrings("volume", entry.getKey());
+    try std.testing.expectEqualStrings("75", entry.getValue());
+}
+
+test "SettingResult found" {
+    const result = SettingResult.initFound("theme", "dark");
+    try std.testing.expect(result.found);
+    try std.testing.expect(result.isSuccess());
+    try std.testing.expectEqualStrings("theme", result.entry.getKey());
+    try std.testing.expectEqualStrings("dark", result.entry.getValue());
+}
+
+test "SettingResult not found" {
+    const result = SettingResult.initNotFound();
+    try std.testing.expect(!result.found);
+    try std.testing.expect(result.isSuccess());
+}
+
+test "ScrobbleRecord initialization" {
+    const record = ScrobbleRecord.init();
+    try std.testing.expectEqual(@as(i64, 0), record.id);
+    try std.testing.expect(!record.submitted);
+}
+
+test "ScrobbleRecord setters and getters" {
+    var record = ScrobbleRecord.init();
+    record.setArtist("The Beatles");
+    record.setTrack("Hey Jude");
+    record.setAlbum("Past Masters");
+    record.timestamp = 1234567890;
+    record.duration = 431;
+
+    try std.testing.expectEqualStrings("The Beatles", record.getArtist());
+    try std.testing.expectEqualStrings("Hey Jude", record.getTrack());
+    try std.testing.expectEqualStrings("Past Masters", record.getAlbum());
+}
+
+test "ScrobbleQueryResult success" {
+    var scrobbles: [2]ScrobbleRecord = undefined;
+    scrobbles[0] = ScrobbleRecord.init();
+    scrobbles[0].setArtist("Artist 1");
+    scrobbles[1] = ScrobbleRecord.init();
+    scrobbles[1].setArtist("Artist 2");
+
+    const result = ScrobbleQueryResult.initSuccess(&scrobbles);
+    try std.testing.expect(result.isSuccess());
+    try std.testing.expectEqual(@as(u32, 2), result.count);
+}
+
+test "WatchedFolder initialization" {
+    const folder = WatchedFolder.init();
+    try std.testing.expectEqual(@as(u32, 0), folder.path_len);
+    try std.testing.expect(folder.enabled);
+    try std.testing.expectEqual(ScanMode.manual, folder.getScanMode());
+}
+
+test "WatchedFolder setters and getters" {
+    var folder = WatchedFolder.init();
+    folder.setPath("/home/user/music");
+    folder.setScanMode(.watch);
+    folder.enabled = true;
+
+    try std.testing.expectEqualStrings("/home/user/music", folder.getPath());
+    try std.testing.expectEqual(ScanMode.watch, folder.getScanMode());
+}
+
+test "WatchedFolderResult success" {
+    var folders: [2]WatchedFolder = undefined;
+    folders[0] = WatchedFolder.init();
+    folders[0].setPath("/music/folder1");
+    folders[1] = WatchedFolder.init();
+    folders[1].setPath("/music/folder2");
+
+    const result = WatchedFolderResult.initSuccess(&folders);
+    try std.testing.expect(result.isSuccess());
+    try std.testing.expectEqual(@as(u32, 2), result.count);
+}
+
+test "SettingsManager parseBool" {
+    const allocator = std.testing.allocator;
+    const manager = SettingsManager.init(allocator);
+    _ = manager;
+
+    try std.testing.expectEqual(true, SettingsManager.parseBool("true").?);
+    try std.testing.expectEqual(true, SettingsManager.parseBool("1").?);
+    try std.testing.expectEqual(false, SettingsManager.parseBool("false").?);
+    try std.testing.expectEqual(false, SettingsManager.parseBool("0").?);
+    try std.testing.expect(SettingsManager.parseBool("invalid") == null);
+}
+
+test "SettingsManager parseInt" {
+    try std.testing.expectEqual(@as(i32, 42), SettingsManager.parseInt(i32, "42").?);
+    try std.testing.expectEqual(@as(i32, -10), SettingsManager.parseInt(i32, "-10").?);
+    try std.testing.expect(SettingsManager.parseInt(i32, "not_a_number") == null);
+}
+
+test "SettingsManager parseFloat" {
+    try std.testing.expectApproxEqAbs(@as(f32, 3.14), SettingsManager.parseFloat(f32, "3.14").?, 0.001);
+    try std.testing.expect(SettingsManager.parseFloat(f32, "invalid") == null);
+}
+
+test "SettingsManager formatBool" {
+    try std.testing.expectEqualStrings("true", SettingsManager.formatBool(true));
+    try std.testing.expectEqualStrings("false", SettingsManager.formatBool(false));
+}
+
+test "ScrobbleManager isScrobbleEligible 4 minute rule" {
+    // 4 minutes played on a 10 minute track - eligible
+    try std.testing.expect(ScrobbleManager.isScrobbleEligible(240, 600));
+
+    // 3 minutes played on a 10 minute track - not eligible (under 4 min and under 50%)
+    try std.testing.expect(!ScrobbleManager.isScrobbleEligible(180, 600));
+}
+
+test "ScrobbleManager isScrobbleEligible 50 percent rule" {
+    // 2 minutes played on a 3 minute track - eligible (>50%)
+    try std.testing.expect(ScrobbleManager.isScrobbleEligible(120, 180));
+
+    // 1 minute played on a 3 minute track - not eligible (<50% and <4 min)
+    try std.testing.expect(!ScrobbleManager.isScrobbleEligible(60, 180));
+}
+
+test "ScrobbleManager isScrobbleEligible edge cases" {
+    // Zero duration - not eligible
+    try std.testing.expect(!ScrobbleManager.isScrobbleEligible(0, 300));
+    try std.testing.expect(!ScrobbleManager.isScrobbleEligible(300, 0));
+
+    // Negative values - not eligible
+    try std.testing.expect(!ScrobbleManager.isScrobbleEligible(-100, 300));
+    try std.testing.expect(!ScrobbleManager.isScrobbleEligible(100, -300));
+}
diff --git a/zig-core/src/ffi.zig b/zig-core/src/ffi.zig
new file mode 100644
index 0000000..9f98e88
--- /dev/null
+++ b/zig-core/src/ffi.zig
@@ -0,0 +1,1299 @@
+//! FFI exports for Rust/Tauri integration
+//!
+//! All functions use C ABI and fixed-size types for safe FFI.
+
+const std = @import("std");
+const types = @import("types.zig");
+const scanner = @import("scanner/scanner.zig");
+const metadata = @import("scanner/metadata.zig");
+
+const ExtractedMetadata = types.ExtractedMetadata;
+const FileFingerprint = types.FileFingerprint;
+const ScanStats = types.ScanStats;
+
+// Use a general purpose allocator for FFI allocations
+var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+
+// ============================================================================
+// Scanner FFI
+// ============================================================================
+
+/// Extract metadata from a single file.
+/// Returns a pointer to ExtractedMetadata that must be freed with mt_free_metadata.
+export fn mt_extract_metadata(path_ptr: [*:0]const u8) callconv(.C) ?*ExtractedMetadata {
+    const path = std.mem.span(path_ptr);
+
+    const result = gpa.allocator().create(ExtractedMetadata) catch return null;
+    result.* = metadata.extractMetadata(path);
+
+    return result;
+}
+
+/// Free metadata returned by mt_extract_metadata
+export fn mt_free_metadata(ptr: ?*ExtractedMetadata) callconv(.C) void {
+    if (ptr) |p| {
+        gpa.allocator().destroy(p);
+    }
+}
+
+/// Extract metadata into a caller-provided buffer (no allocation).
+/// Returns true on success.
+export fn mt_extract_metadata_into(
+    path_ptr: [*:0]const u8,
+    out: *ExtractedMetadata,
+) callconv(.C) bool {
+    const path = std.mem.span(path_ptr);
+    out.* = metadata.extractMetadata(path);
+    return out.is_valid;
+}
+
+/// Batch extract metadata from multiple files.
+/// Caller provides arrays for paths and results.
+/// Returns number of successfully extracted files.
+export fn mt_extract_metadata_batch(
+    paths: [*]const [*:0]const u8,
+    count: usize,
+    results: [*]ExtractedMetadata,
+) callconv(.C) usize {
+    var success_count: usize = 0;
+
+    for (0..count) |i| {
+        const path = std.mem.span(paths[i]);
+        results[i] = metadata.extractMetadata(path);
+        if (results[i].is_valid) {
+            success_count += 1;
+        }
+    }
+
+    return success_count;
+}
+
+/// Check if a file has a supported audio extension
+export fn mt_is_audio_file(path_ptr: [*:0]const u8) callconv(.C) bool {
+    const path = std.mem.span(path_ptr);
+    return types.isAudioFile(path);
+}
+
+// ============================================================================
+// Fingerprint FFI
+// ============================================================================
+
+/// Get file fingerprint from path.
+/// Returns true on success, populates out_fp.
+export fn mt_get_fingerprint(
+    path_ptr: [*:0]const u8,
+    out_fp: *FileFingerprint,
+) callconv(.C) bool {
+    const path = std.mem.span(path_ptr);
+
+    const fp = @import("scanner/fingerprint.zig").fromPath(path) catch {
+        return false;
+    };
+
+    out_fp.* = fp;
+    return true;
+}
+
+/// Compare two fingerprints for equality (ignores inode)
+export fn mt_fingerprint_matches(
+    fp1: *const FileFingerprint,
+    fp2: *const FileFingerprint,
+) callconv(.C) bool {
+    return fp1.matches(fp2.*);
+}
+
+// ============================================================================
+// Memory management
+// ============================================================================
+
+/// Allocate a buffer of the given size.
+/// Returns null on failure.
+export fn mt_alloc(size: usize) callconv(.C) ?[*]u8 {
+    const slice = gpa.allocator().alloc(u8, size) catch return null;
+    return slice.ptr;
+}
+
+/// Free a buffer allocated by mt_alloc.
+export fn mt_free(ptr: ?[*]u8, size: usize) callconv(.C) void {
+    if (ptr) |p| {
+        gpa.allocator().free(p[0..size]);
+    }
+}
+
+// ============================================================================
+// Version info
+// ============================================================================
+
+/// Get library version string
+export fn mt_version() callconv(.C) [*:0]const u8 {
+    return "0.1.0";
+}
+
+// ============================================================================
+// Artwork Cache FFI
+// ============================================================================
+
+const artwork_cache = @import("scanner/artwork_cache.zig");
+pub const Artwork = artwork_cache.Artwork;
+pub const ArtworkCache = artwork_cache.ArtworkCache;
+
+/// Create new artwork cache with default capacity (100 entries).
+/// Returns opaque handle or null on allocation failure.
+export fn mt_artwork_cache_new() callconv(.C) ?*ArtworkCache {
+    return ArtworkCache.init(gpa.allocator(), artwork_cache.DEFAULT_CACHE_SIZE) catch null;
+}
+
+/// Create artwork cache with custom capacity.
+/// Returns opaque handle or null on allocation failure.
+export fn mt_artwork_cache_new_with_capacity(capacity: usize) callconv(.C) ?*ArtworkCache {
+    return ArtworkCache.init(gpa.allocator(), capacity) catch null;
+}
+
+/// Get artwork for track, loading from file if not cached.
+/// Returns true if artwork was found, false otherwise.
+/// The out parameter is populated only when returning true.
+export fn mt_artwork_cache_get_or_load(
+    cache: ?*ArtworkCache,
+    track_id: i64,
+    filepath: [*:0]const u8,
+    out: *Artwork,
+) callconv(.C) bool {
+    const c = cache orelse return false;
+    if (c.getOrLoad(track_id, filepath)) |artwork| {
+        out.* = artwork;
+        return true;
+    }
+    return false;
+}
+
+/// Invalidate cache entry for a specific track.
+/// Call this when track metadata is updated.
+export fn mt_artwork_cache_invalidate(
+    cache: ?*ArtworkCache,
+    track_id: i64,
+) callconv(.C) void {
+    const c = cache orelse return;
+    c.invalidate(track_id);
+}
+
+/// Clear all cache entries.
+export fn mt_artwork_cache_clear(cache: ?*ArtworkCache) callconv(.C) void {
+    const c = cache orelse return;
+    c.clear();
+}
+
+/// Get current number of cached items.
+export fn mt_artwork_cache_len(cache: ?*ArtworkCache) callconv(.C) usize {
+    const c = cache orelse return 0;
+    return c.len();
+}
+
+/// Free artwork cache and all associated resources.
+export fn mt_artwork_cache_free(cache: ?*ArtworkCache) callconv(.C) void {
+    const c = cache orelse return;
+    c.deinit();
+}
+
+// ============================================================================
+// Inventory Scanner FFI
+// ============================================================================
+
+const inventory = @import("scanner/inventory.zig");
+
+/// Opaque handle for inventory scanner
+pub const InventoryScannerHandle = *InventoryScannerState;
+
+/// Internal state for FFI inventory scanner
+const InventoryScannerState = struct {
+    allocator: std.mem.Allocator,
+    paths: std.ArrayList([]const u8),
+    db_fingerprints: std.ArrayList(inventory.DbFingerprint),
+    result: ?inventory.InventoryResult,
+    recursive: bool,
+
+    fn init(allocator: std.mem.Allocator) !*InventoryScannerState {
+        const state = try allocator.create(InventoryScannerState);
+        state.* = .{
+            .allocator = allocator,
+            .paths = std.ArrayList([]const u8).init(allocator),
+            .db_fingerprints = std.ArrayList(inventory.DbFingerprint).init(allocator),
+            .result = null,
+            .recursive = true,
+        };
+        return state;
+    }
+
+    fn deinit(self: *InventoryScannerState) void {
+        // Free path strings
+        for (self.paths.items) |path| {
+            self.allocator.free(path);
+        }
+        self.paths.deinit();
+
+        // Free DB fingerprint path strings
+        for (self.db_fingerprints.items) |entry| {
+            self.allocator.free(entry.filepath);
+        }
+        self.db_fingerprints.deinit();
+
+        // Free result if present
+        if (self.result) |*result| {
+            result.deinit();
+        }
+
+        self.allocator.destroy(self);
+    }
+};
+
+/// Create a new inventory scanner.
+/// Returns opaque handle or null on allocation failure.
+export fn mt_inventory_scanner_new() callconv(.C) ?*InventoryScannerState {
+    return InventoryScannerState.init(gpa.allocator()) catch null;
+}
+
+/// Set recursive mode for directory scanning.
+export fn mt_inventory_scanner_set_recursive(
+    handle: ?*InventoryScannerState,
+    recursive: bool,
+) callconv(.C) void {
+    const s = handle orelse return;
+    s.recursive = recursive;
+}
+
+/// Add a path to scan.
+/// Returns true on success, false on allocation failure.
+export fn mt_inventory_scanner_add_path(
+    handle: ?*InventoryScannerState,
+    path_ptr: [*:0]const u8,
+) callconv(.C) bool {
+    const s = handle orelse return false;
+    const path = std.mem.span(path_ptr);
+
+    // Duplicate the path string
+    const path_copy = s.allocator.dupe(u8, path) catch return false;
+    s.paths.append(path_copy) catch {
+        s.allocator.free(path_copy);
+        return false;
+    };
+    return true;
+}
+
+/// Add a database fingerprint for comparison.
+/// Returns true on success, false on allocation failure.
+export fn mt_inventory_scanner_add_db_fingerprint(
+    handle: ?*InventoryScannerState,
+    path_ptr: [*:0]const u8,
+    fp: *const FileFingerprint,
+) callconv(.C) bool {
+    const s = handle orelse return false;
+    const path = std.mem.span(path_ptr);
+
+    // Duplicate the path string
+    const path_copy = s.allocator.dupe(u8, path) catch return false;
+    s.db_fingerprints.append(.{
+        .filepath = path_copy,
+        .fingerprint = fp.*,
+    }) catch {
+        s.allocator.free(path_copy);
+        return false;
+    };
+    return true;
+}
+
+/// Progress callback type for inventory scanning
+pub const InventoryProgressCallback = ?*const fn (visited: usize) callconv(.C) void;
+
+/// Run the inventory scan.
+/// Returns true on success, false on error.
+export fn mt_inventory_scanner_run(
+    handle: ?*InventoryScannerState,
+    progress_callback: InventoryProgressCallback,
+) callconv(.C) bool {
+    const s = handle orelse return false;
+
+    // Clear any previous result
+    if (s.result) |*result| {
+        result.deinit();
+        s.result = null;
+    }
+
+    // Run inventory
+    s.result = inventory.runInventory(
+        s.allocator,
+        s.paths.items,
+        s.db_fingerprints.items,
+        s.recursive,
+        progress_callback,
+    ) catch return false;
+
+    return true;
+}
+
+/// Get the count of added files.
+export fn mt_inventory_scanner_get_added_count(
+    handle: ?*InventoryScannerState,
+) callconv(.C) usize {
+    const s = handle orelse return 0;
+    const result = s.result orelse return 0;
+    return result.added.items.len;
+}
+
+/// Get the count of modified files.
+export fn mt_inventory_scanner_get_modified_count(
+    handle: ?*InventoryScannerState,
+) callconv(.C) usize {
+    const s = handle orelse return 0;
+    const result = s.result orelse return 0;
+    return result.modified.items.len;
+}
+
+/// Get the count of unchanged files.
+export fn mt_inventory_scanner_get_unchanged_count(
+    handle: ?*InventoryScannerState,
+) callconv(.C) usize {
+    const s = handle orelse return 0;
+    const result = s.result orelse return 0;
+    return result.unchanged.items.len;
+}
+
+/// Get the count of deleted files.
+export fn mt_inventory_scanner_get_deleted_count(
+    handle: ?*InventoryScannerState,
+) callconv(.C) usize {
+    const s = handle orelse return 0;
+    const result = s.result orelse return 0;
+    return result.deleted.items.len;
+}
+
+/// Get an added file entry by index.
+/// Returns true if index is valid and data was written.
+export fn mt_inventory_scanner_get_added(
+    handle: ?*InventoryScannerState,
+    index: usize,
+    out_path: *[4096]u8,
+    out_path_len: *u32,
+    out_fp: *FileFingerprint,
+) callconv(.C) bool {
+    const s = handle orelse return false;
+    const result = s.result orelse return false;
+
+    if (index >= result.added.items.len) return false;
+
+    const entry = result.added.items[index];
+
+    // Copy path
+    const copy_len = @min(entry.filepath.len, out_path.len);
+    @memcpy(out_path[0..copy_len], entry.filepath[0..copy_len]);
+    out_path_len.* = @intCast(copy_len);
+
+    // Copy fingerprint
+    out_fp.* = entry.fingerprint;
+
+    return true;
+}
+
+/// Get a modified file entry by index.
+/// Returns true if index is valid and data was written.
+export fn mt_inventory_scanner_get_modified(
+    handle: ?*InventoryScannerState,
+    index: usize,
+    out_path: *[4096]u8,
+    out_path_len: *u32,
+    out_fp: *FileFingerprint,
+) callconv(.C) bool {
+    const s = handle orelse return false;
+    const result = s.result orelse return false;
+
+    if (index >= result.modified.items.len) return false;
+
+    const entry = result.modified.items[index];
+
+    // Copy path
+    const copy_len = @min(entry.filepath.len, out_path.len);
+    @memcpy(out_path[0..copy_len], entry.filepath[0..copy_len]);
+    out_path_len.* = @intCast(copy_len);
+
+    // Copy fingerprint
+    out_fp.* = entry.fingerprint;
+
+    return true;
+}
+
+/// Get an unchanged file path by index.
+/// Returns true if index is valid and data was written.
+export fn mt_inventory_scanner_get_unchanged(
+    handle: ?*InventoryScannerState,
+    index: usize,
+    out_path: *[4096]u8,
+    out_path_len: *u32,
+) callconv(.C) bool {
+    const s = handle orelse return false;
+    const result = s.result orelse return false;
+
+    if (index >= result.unchanged.items.len) return false;
+
+    const filepath = result.unchanged.items[index];
+
+    // Copy path
+    const copy_len = @min(filepath.len, out_path.len);
+    @memcpy(out_path[0..copy_len], filepath[0..copy_len]);
+    out_path_len.* = @intCast(copy_len);
+
+    return true;
+}
+
+/// Get a deleted file path by index.
+/// Returns true if index is valid and data was written.
+export fn mt_inventory_scanner_get_deleted(
+    handle: ?*InventoryScannerState,
+    index: usize,
+    out_path: *[4096]u8,
+    out_path_len: *u32,
+) callconv(.C) bool {
+    const s = handle orelse return false;
+    const result = s.result orelse return false;
+
+    if (index >= result.deleted.items.len) return false;
+
+    const filepath = result.deleted.items[index];
+
+    // Copy path
+    const copy_len = @min(filepath.len, out_path.len);
+    @memcpy(out_path[0..copy_len], filepath[0..copy_len]);
+    out_path_len.* = @intCast(copy_len);
+
+    return true;
+}
+
+/// Get scan statistics.
+export fn mt_inventory_scanner_get_stats(
+    handle: ?*InventoryScannerState,
+    out_stats: *ScanStats,
+) callconv(.C) void {
+    const s = handle orelse {
+        out_stats.* = std.mem.zeroes(ScanStats);
+        return;
+    };
+    const result = s.result orelse {
+        out_stats.* = std.mem.zeroes(ScanStats);
+        return;
+    };
+    out_stats.* = result.stats;
+}
+
+/// Free the inventory scanner and all associated resources.
+export fn mt_inventory_scanner_free(handle: ?*InventoryScannerState) callconv(.C) void {
+    const s = handle orelse return;
+    s.deinit();
+}
+
+// ============================================================================
+// Tests
+// ============================================================================
+
+test "FFI inventory scanner creation" {
+    const handle = mt_inventory_scanner_new();
+    try std.testing.expect(handle != null);
+    mt_inventory_scanner_free(handle);
+}
+
+test "FFI inventory scanner add path" {
+    const handle = mt_inventory_scanner_new();
+    defer mt_inventory_scanner_free(handle);
+
+    const success = mt_inventory_scanner_add_path(handle, "/test/path");
+    try std.testing.expect(success);
+}
+
+test "FFI inventory scanner add db fingerprint" {
+    const handle = mt_inventory_scanner_new();
+    defer mt_inventory_scanner_free(handle);
+
+    const fp = FileFingerprint{
+        .mtime_ns = 1234567890,
+        .size = 1000,
+        .inode = 0,
+        .has_mtime = true,
+        .has_inode = false,
+    };
+    const success = mt_inventory_scanner_add_db_fingerprint(handle, "/test/song.mp3", &fp);
+    try std.testing.expect(success);
+}
+
+test "FFI metadata extraction" {
+    var m: ExtractedMetadata = undefined;
+    const success = mt_extract_metadata_into("/nonexistent/path.mp3", &m);
+    try std.testing.expect(!success);
+    try std.testing.expect(!m.is_valid);
+}
+
+test "FFI is_audio_file" {
+    try std.testing.expect(mt_is_audio_file("song.mp3"));
+    try std.testing.expect(mt_is_audio_file("track.FLAC"));
+    try std.testing.expect(!mt_is_audio_file("image.jpg"));
+}
+
+// ============================================================================
+// Database Models FFI
+// ============================================================================
+
+const db_models = @import("db/models.zig");
+const db_library = @import("db/library.zig");
+const db_queue = @import("db/queue.zig");
+const db_settings = @import("db/settings.zig");
+
+// Re-export types for Rust bindings
+pub const Track = db_models.Track;
+pub const Playlist = db_models.Playlist;
+pub const PlaylistItem = db_models.PlaylistItem;
+pub const QueueItem = db_models.QueueItem;
+pub const QueueState = db_models.QueueState;
+pub const Setting = db_models.Setting;
+pub const Favorite = db_models.Favorite;
+pub const LyricsCache = db_models.LyricsCache;
+pub const ScrobbleEntry = db_models.ScrobbleEntry;
+pub const WatchedFolder = db_models.WatchedFolder;
+
+// Library query types
+pub const SearchParams = db_library.SearchParams;
+pub const SortField = db_library.SortField;
+pub const SortOrder = db_library.SortOrder;
+pub const TrackQueryResult = db_library.TrackQueryResult;
+pub const SingleTrackResult = db_library.SingleTrackResult;
+pub const UpsertResult = db_library.UpsertResult;
+
+// Queue types
+pub const QueueItemFull = db_queue.QueueItemFull;
+pub const QueueSnapshot = db_queue.QueueSnapshot;
+pub const QueueQueryResult = db_queue.QueueQueryResult;
+pub const PlaylistInfo = db_queue.PlaylistInfo;
+pub const PlaylistQueryResult = db_queue.PlaylistQueryResult;
+pub const FavoriteEntry = db_queue.FavoriteEntry;
+pub const FavoritesQueryResult = db_queue.FavoritesQueryResult;
+
+// Settings types
+pub const SettingEntry = db_settings.SettingEntry;
+pub const SettingResult = db_settings.SettingResult;
+pub const ScrobbleRecord = db_settings.ScrobbleRecord;
+pub const ScrobbleQueryResult = db_settings.ScrobbleQueryResult;
+pub const WatchedFolderFFI = db_settings.WatchedFolder;
+pub const WatchedFolderResult = db_settings.WatchedFolderResult;
+
+// ============================================================================
+// Track FFI Functions
+// ============================================================================
+
+/// Create a new empty track
+export fn mt_track_new() callconv(.C) Track {
+    return Track.init();
+}
+
+/// Set track filepath
+export fn mt_track_set_filepath(track: *Track, path_ptr: [*:0]const u8) callconv(.C) void {
+    const path = std.mem.span(path_ptr);
+    track.setFilepath(path);
+}
+
+/// Set track title
+export fn mt_track_set_title(track: *Track, title_ptr: [*:0]const u8) callconv(.C) void {
+    const title = std.mem.span(title_ptr);
+    track.setTitle(title);
+}
+
+/// Set track artist
+export fn mt_track_set_artist(track: *Track, artist_ptr: [*:0]const u8) callconv(.C) void {
+    const artist = std.mem.span(artist_ptr);
+    track.setArtist(artist);
+}
+
+/// Set track album
+export fn mt_track_set_album(track: *Track, album_ptr: [*:0]const u8) callconv(.C) void {
+    const album = std.mem.span(album_ptr);
+    track.setAlbum(album);
+}
+
+/// Validate track data
+export fn mt_track_validate(track: *const Track) callconv(.C) bool {
+    return db_library.validateTrack(track);
+}
+
+/// Normalize track strings (trim whitespace)
+export fn mt_track_normalize(track: *Track) callconv(.C) void {
+    db_library.normalizeTrackStrings(track);
+}
+
+// ============================================================================
+// Search Parameters FFI Functions
+// ============================================================================
+
+/// Create new search parameters with defaults
+export fn mt_search_params_new() callconv(.C) SearchParams {
+    return SearchParams.init();
+}
+
+/// Set search query
+export fn mt_search_params_set_query(params: *SearchParams, query_ptr: [*:0]const u8) callconv(.C) void {
+    const query = std.mem.span(query_ptr);
+    params.setQuery(query);
+}
+
+/// Set search limit
+export fn mt_search_params_set_limit(params: *SearchParams, limit: u32) callconv(.C) void {
+    params.limit = limit;
+}
+
+/// Set search offset
+export fn mt_search_params_set_offset(params: *SearchParams, offset: u32) callconv(.C) void {
+    params.offset = offset;
+}
+
+/// Set sort field
+export fn mt_search_params_set_sort_by(params: *SearchParams, sort_by: u8) callconv(.C) void {
+    params.sort_by = @enumFromInt(sort_by);
+}
+
+/// Set sort order
+export fn mt_search_params_set_sort_order(params: *SearchParams, sort_order: u8) callconv(.C) void {
+    params.sort_order = @enumFromInt(sort_order);
+}
+
+// ============================================================================
+// Queue Manager FFI Functions
+// ============================================================================
+
+/// Calculate move positions for queue item reordering
+export fn mt_queue_calculate_move(
+    from_pos: u32,
+    to_pos: u32,
+    total_items: u32,
+    out_shift_start: *u32,
+    out_shift_end: *u32,
+    out_shift_direction: *u8,
+) callconv(.C) bool {
+    var manager = db_queue.QueueManager.init(gpa.allocator());
+    const result = manager.calculateMovePositions(from_pos, to_pos, total_items);
+
+    if (result.error_code != 0) {
+        return false;
+    }
+
+    out_shift_start.* = result.shift_start;
+    out_shift_end.* = result.shift_end;
+    out_shift_direction.* = @intFromEnum(result.shift_direction);
+    return true;
+}
+
+/// Build shuffle order using Fisher-Yates algorithm
+/// Returns allocated array that must be freed with mt_free
+export fn mt_queue_build_shuffle_order(
+    count: u32,
+    current_position: u32,
+    random_seed: u64,
+    out_order: *[*]u32,
+    out_len: *u32,
+) callconv(.C) bool {
+    var manager = db_queue.QueueManager.init(gpa.allocator());
+    const order = manager.buildShuffleOrder(count, current_position, random_seed) catch return false;
+
+    out_order.* = order.ptr;
+    out_len.* = @intCast(order.len);
+    return true;
+}
+
+/// Free shuffle order array
+export fn mt_queue_free_shuffle_order(order: [*]u32, len: u32) callconv(.C) void {
+    gpa.allocator().free(order[0..len]);
+}
+
+// ============================================================================
+// Playlist FFI Functions
+// ============================================================================
+
+/// Create a new empty playlist
+export fn mt_playlist_new() callconv(.C) Playlist {
+    return Playlist.init();
+}
+
+/// Set playlist name
+export fn mt_playlist_set_name(playlist: *Playlist, name_ptr: [*:0]const u8) callconv(.C) void {
+    const name = std.mem.span(name_ptr);
+    playlist.setName(name);
+}
+
+/// Create new playlist info
+export fn mt_playlist_info_new() callconv(.C) PlaylistInfo {
+    return PlaylistInfo.init();
+}
+
+/// Set playlist info name
+export fn mt_playlist_info_set_name(info: *PlaylistInfo, name_ptr: [*:0]const u8) callconv(.C) void {
+    const name = std.mem.span(name_ptr);
+    info.setName(name);
+}
+
+// ============================================================================
+// Settings FFI Functions
+// ============================================================================
+
+/// Create new setting entry
+export fn mt_setting_new() callconv(.C) SettingEntry {
+    return SettingEntry.init();
+}
+
+/// Set setting key
+export fn mt_setting_set_key(entry: *SettingEntry, key_ptr: [*:0]const u8) callconv(.C) void {
+    const key = std.mem.span(key_ptr);
+    entry.setKey(key);
+}
+
+/// Set setting value
+export fn mt_setting_set_value(entry: *SettingEntry, value_ptr: [*:0]const u8) callconv(.C) void {
+    const value = std.mem.span(value_ptr);
+    entry.setValue(value);
+}
+
+/// Parse boolean setting value
+export fn mt_setting_parse_bool(value_ptr: [*:0]const u8, out_value: *bool) callconv(.C) bool {
+    const value = std.mem.span(value_ptr);
+    if (db_settings.SettingsManager.parseBool(value)) |b| {
+        out_value.* = b;
+        return true;
+    }
+    return false;
+}
+
+/// Parse i32 setting value
+export fn mt_setting_parse_i32(value_ptr: [*:0]const u8, out_value: *i32) callconv(.C) bool {
+    const value = std.mem.span(value_ptr);
+    if (db_settings.SettingsManager.parseInt(i32, value)) |v| {
+        out_value.* = v;
+        return true;
+    }
+    return false;
+}
+
+/// Parse f32 setting value
+export fn mt_setting_parse_f32(value_ptr: [*:0]const u8, out_value: *f32) callconv(.C) bool {
+    const value = std.mem.span(value_ptr);
+    if (db_settings.SettingsManager.parseFloat(f32, value)) |v| {
+        out_value.* = v;
+        return true;
+    }
+    return false;
+}
+
+// ============================================================================
+// Scrobble FFI Functions
+// ============================================================================
+
+/// Create new scrobble record
+export fn mt_scrobble_new() callconv(.C) ScrobbleRecord {
+    return ScrobbleRecord.init();
+}
+
+/// Set scrobble artist
+export fn mt_scrobble_set_artist(record: *ScrobbleRecord, artist_ptr: [*:0]const u8) callconv(.C) void {
+    const artist = std.mem.span(artist_ptr);
+    record.setArtist(artist);
+}
+
+/// Set scrobble track
+export fn mt_scrobble_set_track(record: *ScrobbleRecord, track_ptr: [*:0]const u8) callconv(.C) void {
+    const track = std.mem.span(track_ptr);
+    record.setTrack(track);
+}
+
+/// Set scrobble album
+export fn mt_scrobble_set_album(record: *ScrobbleRecord, album_ptr: [*:0]const u8) callconv(.C) void {
+    const album = std.mem.span(album_ptr);
+    record.setAlbum(album);
+}
+
+/// Check if a play is eligible for scrobbling
+export fn mt_scrobble_is_eligible(played_duration: i32, track_duration: i32) callconv(.C) bool {
+    return db_settings.ScrobbleManager.isScrobbleEligible(played_duration, track_duration);
+}
+
+// ============================================================================
+// Watched Folder FFI Functions
+// ============================================================================
+
+/// Create new watched folder
+export fn mt_watched_folder_new() callconv(.C) WatchedFolderFFI {
+    return WatchedFolderFFI.init();
+}
+
+/// Set watched folder path
+export fn mt_watched_folder_set_path(folder: *WatchedFolderFFI, path_ptr: [*:0]const u8) callconv(.C) void {
+    const path = std.mem.span(path_ptr);
+    folder.setPath(path);
+}
+
+/// Set watched folder scan mode
+export fn mt_watched_folder_set_scan_mode(folder: *WatchedFolderFFI, mode: u8) callconv(.C) void {
+    folder.setScanMode(@enumFromInt(mode));
+}
+
+// ============================================================================
+// Queue Item FFI Functions
+// ============================================================================
+
+/// Create new queue item
+export fn mt_queue_item_new() callconv(.C) QueueItem {
+    return QueueItem.init();
+}
+
+/// Set queue item filepath
+export fn mt_queue_item_set_filepath(item: *QueueItem, path_ptr: [*:0]const u8) callconv(.C) void {
+    const path = std.mem.span(path_ptr);
+    item.setFilepath(path);
+}
+
+/// Create new queue snapshot
+export fn mt_queue_snapshot_new() callconv(.C) QueueSnapshot {
+    return QueueSnapshot.init();
+}
+
+// ============================================================================
+// Last.fm FFI Types
+// ============================================================================
+
+const lastfm_types = @import("lastfm/types.zig");
+const lastfm_client = @import("lastfm/client.zig");
+
+// Re-export Last.fm types for Rust bindings
+pub const ScrobbleRequest = lastfm_types.ScrobbleRequest;
+pub const NowPlayingRequest = lastfm_types.NowPlayingRequest;
+pub const LastfmMethod = lastfm_types.Method;
+pub const LastfmErrorCode = lastfm_types.ErrorCode;
+pub const BuiltRequest = lastfm_client.BuiltRequest;
+pub const ApiResponse = lastfm_client.ApiResponse;
+pub const LastfmConfig = lastfm_client.Config;
+// Note: RateLimiter contains Mutex and is not FFI-compatible as a value type
+// Rate limiting is accessed through the Client pointer
+pub const LastfmClient = lastfm_client.Client;
+
+// ============================================================================
+// Last.fm Scrobble Request FFI
+// ============================================================================
+
+/// Create new scrobble request
+export fn mt_lastfm_scrobble_request_new() callconv(.C) ScrobbleRequest {
+    return ScrobbleRequest.init();
+}
+
+/// Set scrobble request artist
+export fn mt_lastfm_scrobble_set_artist(req: *ScrobbleRequest, artist_ptr: [*:0]const u8) callconv(.C) void {
+    const artist = std.mem.span(artist_ptr);
+    req.setArtist(artist);
+}
+
+/// Set scrobble request track
+export fn mt_lastfm_scrobble_set_track(req: *ScrobbleRequest, track_ptr: [*:0]const u8) callconv(.C) void {
+    const track = std.mem.span(track_ptr);
+    req.setTrack(track);
+}
+
+/// Set scrobble request album
+export fn mt_lastfm_scrobble_set_album(req: *ScrobbleRequest, album_ptr: [*:0]const u8) callconv(.C) void {
+    const album = std.mem.span(album_ptr);
+    req.setAlbum(album);
+}
+
+/// Set scrobble request timestamp
+export fn mt_lastfm_scrobble_set_timestamp(req: *ScrobbleRequest, timestamp: i64) callconv(.C) void {
+    req.timestamp = timestamp;
+}
+
+/// Set scrobble request duration
+export fn mt_lastfm_scrobble_set_duration(req: *ScrobbleRequest, duration: i32) callconv(.C) void {
+    req.duration = duration;
+}
+
+/// Set scrobble request track number
+export fn mt_lastfm_scrobble_set_track_number(req: *ScrobbleRequest, track_number: u32) callconv(.C) void {
+    req.track_number = track_number;
+}
+
+// ============================================================================
+// Last.fm Now Playing Request FFI
+// ============================================================================
+
+/// Create new now playing request
+export fn mt_lastfm_now_playing_request_new() callconv(.C) NowPlayingRequest {
+    return NowPlayingRequest.init();
+}
+
+/// Set now playing request artist
+export fn mt_lastfm_now_playing_set_artist(req: *NowPlayingRequest, artist_ptr: [*:0]const u8) callconv(.C) void {
+    const artist = std.mem.span(artist_ptr);
+    const len = @min(artist.len, req.artist.len);
+    @memcpy(req.artist[0..len], artist[0..len]);
+    req.artist_len = @intCast(len);
+}
+
+/// Set now playing request track
+export fn mt_lastfm_now_playing_set_track(req: *NowPlayingRequest, track_ptr: [*:0]const u8) callconv(.C) void {
+    const track = std.mem.span(track_ptr);
+    const len = @min(track.len, req.track.len);
+    @memcpy(req.track[0..len], track[0..len]);
+    req.track_len = @intCast(len);
+}
+
+/// Set now playing request album
+export fn mt_lastfm_now_playing_set_album(req: *NowPlayingRequest, album_ptr: [*:0]const u8) callconv(.C) void {
+    const album = std.mem.span(album_ptr);
+    const len = @min(album.len, req.album.len);
+    @memcpy(req.album[0..len], album[0..len]);
+    req.album_len = @intCast(len);
+}
+
+/// Set now playing request duration
+export fn mt_lastfm_now_playing_set_duration(req: *NowPlayingRequest, duration: i32) callconv(.C) void {
+    req.duration = duration;
+}
+
+/// Set now playing request track number
+export fn mt_lastfm_now_playing_set_track_number(req: *NowPlayingRequest, track_number: u32) callconv(.C) void {
+    req.track_number = track_number;
+}
+
+// ============================================================================
+// Last.fm Client FFI
+// ============================================================================
+
+/// Create new Last.fm client
+/// Returns null on allocation failure
+export fn mt_lastfm_client_new(
+    api_key_ptr: [*:0]const u8,
+    api_secret_ptr: [*:0]const u8,
+) callconv(.C) ?*LastfmClient {
+    const api_key = std.mem.span(api_key_ptr);
+    const api_secret = std.mem.span(api_secret_ptr);
+    return LastfmClient.init(gpa.allocator(), api_key, api_secret) catch null;
+}
+
+/// Free Last.fm client
+export fn mt_lastfm_client_free(client: ?*LastfmClient) callconv(.C) void {
+    if (client) |c| {
+        c.deinit();
+    }
+}
+
+/// Set client session key for authenticated requests
+export fn mt_lastfm_client_set_session_key(
+    client: *LastfmClient,
+    session_key_ptr: [*:0]const u8,
+) callconv(.C) void {
+    const session_key = std.mem.span(session_key_ptr);
+    client.setSessionKey(session_key);
+}
+
+/// Clear client session key (logout)
+export fn mt_lastfm_client_clear_session_key(client: *LastfmClient) callconv(.C) void {
+    client.clearSessionKey();
+}
+
+/// Check if client has a valid session key
+export fn mt_lastfm_client_is_authenticated(client: *const LastfmClient) callconv(.C) bool {
+    return client.isAuthenticated();
+}
+
+/// Build a scrobble request
+/// Returns true on success, populates out_request
+export fn mt_lastfm_client_build_scrobble(
+    client: *LastfmClient,
+    scrobble: *const ScrobbleRequest,
+    out_request: *BuiltRequest,
+) callconv(.C) bool {
+    const result = client.buildScrobbleRequest(scrobble) catch return false;
+    out_request.* = result;
+    return true;
+}
+
+/// Build a now playing request
+/// Returns true on success, populates out_request
+export fn mt_lastfm_client_build_now_playing(
+    client: *LastfmClient,
+    now_playing: *const NowPlayingRequest,
+    out_request: *BuiltRequest,
+) callconv(.C) bool {
+    const result = client.buildNowPlayingRequest(now_playing) catch return false;
+    out_request.* = result;
+    return true;
+}
+
+/// Wait for rate limit slot (blocking)
+export fn mt_lastfm_client_wait_for_rate_limit(client: *LastfmClient) callconv(.C) void {
+    client.waitForRateLimit();
+}
+
+// ============================================================================
+// Last.fm Rate Limiter FFI (via client pointer)
+// ============================================================================
+
+// Note: RateLimiter contains Mutex which is not FFI-compatible as a return value.
+// Rate limiting is accessed through the client's rate limiter via pointer.
+
+/// Get wait time in nanoseconds from client's rate limiter (0 if no wait needed)
+export fn mt_lastfm_client_get_wait_time_ns(client: *LastfmClient) callconv(.C) u64 {
+    return client.getRateLimiter().getWaitTime();
+}
+
+/// Record that a request was made (for external HTTP callers)
+export fn mt_lastfm_client_record_request(client: *LastfmClient) callconv(.C) void {
+    client.getRateLimiter().recordRequest();
+}
+
+// ============================================================================
+// Last.fm Signature FFI
+// ============================================================================
+
+/// Generate API signature for key-value pairs
+/// pairs_ptr is an array of [key_ptr, value_ptr] pairs (2 * count elements)
+/// Returns true on success, writes 32-char hex signature to out_sig
+export fn mt_lastfm_generate_signature(
+    pairs_ptr: [*]const [*:0]const u8,
+    count: u32,
+    api_secret_ptr: [*:0]const u8,
+    out_sig: [*]u8,
+) callconv(.C) bool {
+    const allocator = gpa.allocator();
+    const api_secret = std.mem.span(api_secret_ptr);
+
+    // Build params from pairs
+    var params = lastfm_types.Params.init(allocator);
+    defer params.deinit();
+
+    var i: u32 = 0;
+    while (i < count) : (i += 1) {
+        const key = std.mem.span(pairs_ptr[i * 2]);
+        const value = std.mem.span(pairs_ptr[i * 2 + 1]);
+        params.put(key, value) catch return false;
+    }
+
+    // Generate signature
+    const sig = lastfm_types.generateSignature(allocator, &params, api_secret) catch return false;
+    defer allocator.free(sig);
+
+    // Copy to output buffer (32 hex chars)
+    @memcpy(out_sig[0..32], sig[0..32]);
+    return true;
+}
+
+// ============================================================================
+// Last.fm Response FFI
+// ============================================================================
+
+/// Create success response
+export fn mt_lastfm_response_success() callconv(.C) ApiResponse {
+    return ApiResponse.initSuccess();
+}
+
+/// Create error response
+export fn mt_lastfm_response_error(error_code: u32, message_ptr: [*:0]const u8) callconv(.C) ApiResponse {
+    const message = std.mem.span(message_ptr);
+    return ApiResponse.initError(error_code, message);
+}
+
+/// Create new built request
+export fn mt_lastfm_built_request_new() callconv(.C) BuiltRequest {
+    return BuiltRequest.init();
+}
+
+/// Get API base URL
+export fn mt_lastfm_get_api_url() callconv(.C) [*:0]const u8 {
+    return lastfm_client.API_BASE_URL;
+}
+
+// ============================================================================
+// Database FFI Tests
+// ============================================================================
+
+test "FFI track creation" {
+    var track = mt_track_new();
+    try std.testing.expectEqual(@as(i64, 0), track.id);
+
+    mt_track_set_filepath(&track, "/music/test.mp3");
+    try std.testing.expectEqualStrings("/music/test.mp3", track.getFilepath());
+
+    mt_track_set_title(&track, "Test Song");
+    try std.testing.expectEqualStrings("Test Song", track.getTitle());
+
+    try std.testing.expect(mt_track_validate(&track));
+}
+
+test "FFI search params" {
+    var params = mt_search_params_new();
+    try std.testing.expectEqual(@as(u32, 100), params.limit);
+
+    mt_search_params_set_query(&params, "beatles");
+    try std.testing.expectEqualStrings("beatles", params.getQuery());
+
+    mt_search_params_set_limit(&params, 50);
+    try std.testing.expectEqual(@as(u32, 50), params.limit);
+}
+
+test "FFI queue move calculation" {
+    var shift_start: u32 = 0;
+    var shift_end: u32 = 0;
+    var shift_direction: u8 = 0;
+
+    const success = mt_queue_calculate_move(2, 5, 10, &shift_start, &shift_end, &shift_direction);
+    try std.testing.expect(success);
+    try std.testing.expectEqual(@as(u32, 2), shift_start);
+    try std.testing.expectEqual(@as(u32, 5), shift_end);
+}
+
+test "FFI setting parsing" {
+    var bool_val: bool = false;
+    try std.testing.expect(mt_setting_parse_bool("true", &bool_val));
+    try std.testing.expect(bool_val);
+
+    var int_val: i32 = 0;
+    try std.testing.expect(mt_setting_parse_i32("42", &int_val));
+    try std.testing.expectEqual(@as(i32, 42), int_val);
+
+    var float_val: f32 = 0;
+    try std.testing.expect(mt_setting_parse_f32("3.14", &float_val));
+    try std.testing.expectApproxEqAbs(@as(f32, 3.14), float_val, 0.001);
+}
+
+test "FFI scrobble eligibility" {
+    // 4 minutes played on 10 minute track - eligible
+    try std.testing.expect(mt_scrobble_is_eligible(240, 600));
+
+    // 2 minutes played on 3 minute track - eligible (>50%)
+    try std.testing.expect(mt_scrobble_is_eligible(120, 180));
+
+    // 1 minute played on 10 minute track - not eligible
+    try std.testing.expect(!mt_scrobble_is_eligible(60, 600));
+}
+
+test "FFI playlist creation" {
+    var playlist = mt_playlist_new();
+    try std.testing.expectEqual(@as(i64, 0), playlist.id);
+
+    mt_playlist_set_name(&playlist, "My Playlist");
+    try std.testing.expectEqualStrings("My Playlist", playlist.getName());
+}
+
+test "FFI watched folder" {
+    var folder = mt_watched_folder_new();
+    try std.testing.expect(folder.enabled);
+
+    mt_watched_folder_set_path(&folder, "/home/user/music");
+    try std.testing.expectEqualStrings("/home/user/music", folder.getPath());
+
+    mt_watched_folder_set_scan_mode(&folder, 2); // watch mode
+    try std.testing.expectEqual(db_settings.ScanMode.watch, folder.getScanMode());
+}
+
+// ============================================================================
+// Last.fm FFI Tests
+// ============================================================================
+
+test "FFI lastfm scrobble request" {
+    var req = mt_lastfm_scrobble_request_new();
+    try std.testing.expectEqual(@as(u32, 0), req.artist_len);
+    try std.testing.expectEqual(@as(u32, 0), req.track_len);
+
+    mt_lastfm_scrobble_set_artist(&req, "The Beatles");
+    try std.testing.expectEqualStrings("The Beatles", req.getArtist());
+
+    mt_lastfm_scrobble_set_track(&req, "Hey Jude");
+    try std.testing.expectEqualStrings("Hey Jude", req.getTrack());
+
+    mt_lastfm_scrobble_set_album(&req, "White Album");
+    try std.testing.expectEqualStrings("White Album", req.getAlbum());
+
+    mt_lastfm_scrobble_set_timestamp(&req, 1234567890);
+    try std.testing.expectEqual(@as(i64, 1234567890), req.timestamp);
+
+    mt_lastfm_scrobble_set_duration(&req, 240);
+    try std.testing.expectEqual(@as(i32, 240), req.duration);
+
+    mt_lastfm_scrobble_set_track_number(&req, 5);
+    try std.testing.expectEqual(@as(u32, 5), req.track_number);
+}
+
+test "FFI lastfm now playing request" {
+    var req = mt_lastfm_now_playing_request_new();
+    try std.testing.expectEqual(@as(u32, 0), req.artist_len);
+
+    mt_lastfm_now_playing_set_artist(&req, "Pink Floyd");
+    try std.testing.expectEqualStrings("Pink Floyd", req.getArtist());
+
+    mt_lastfm_now_playing_set_track(&req, "Comfortably Numb");
+    try std.testing.expectEqualStrings("Comfortably Numb", req.getTrack());
+
+    mt_lastfm_now_playing_set_album(&req, "The Wall");
+    try std.testing.expectEqualStrings("The Wall", req.getAlbum());
+
+    mt_lastfm_now_playing_set_duration(&req, 382);
+    try std.testing.expectEqual(@as(i32, 382), req.duration);
+}
+
+test "FFI lastfm client lifecycle" {
+    const client = mt_lastfm_client_new("test_api_key", "test_api_secret");
+    try std.testing.expect(client != null);
+
+    // Initially not authenticated
+    try std.testing.expect(!mt_lastfm_client_is_authenticated(client.?));
+
+    // Set session key
+    mt_lastfm_client_set_session_key(client.?, "test_session_key");
+    try std.testing.expect(mt_lastfm_client_is_authenticated(client.?));
+
+    // Clear session key
+    mt_lastfm_client_clear_session_key(client.?);
+    try std.testing.expect(!mt_lastfm_client_is_authenticated(client.?));
+
+    mt_lastfm_client_free(client);
+}
+
+test "FFI lastfm client build scrobble" {
+    const client = mt_lastfm_client_new("test_api_key", "test_api_secret");
+    try std.testing.expect(client != null);
+    defer mt_lastfm_client_free(client);
+
+    mt_lastfm_client_set_session_key(client.?, "test_session");
+
+    var scrobble = mt_lastfm_scrobble_request_new();
+    mt_lastfm_scrobble_set_artist(&scrobble, "Test Artist");
+    mt_lastfm_scrobble_set_track(&scrobble, "Test Track");
+    mt_lastfm_scrobble_set_timestamp(&scrobble, 1234567890);
+
+    var built_request = mt_lastfm_built_request_new();
+    const success = mt_lastfm_client_build_scrobble(client.?, &scrobble, &built_request);
+    try std.testing.expect(success);
+    try std.testing.expect(built_request.body_len > 0);
+    try std.testing.expectEqualStrings("track.scrobble", built_request.getApiMethod());
+}
+
+test "FFI lastfm rate limiter via client" {
+    const client = mt_lastfm_client_new("test_api_key", "test_api_secret");
+    try std.testing.expect(client != null);
+    defer mt_lastfm_client_free(client);
+
+    // First request should have no wait (or very small if timing is off)
+    const wait_time = mt_lastfm_client_get_wait_time_ns(client.?);
+    try std.testing.expect(wait_time == 0 or wait_time < 1_000_000); // less than 1ms
+}
+
+test "FFI lastfm response" {
+    const success_resp = mt_lastfm_response_success();
+    try std.testing.expect(success_resp.success);
+    try std.testing.expectEqual(@as(u32, 0), success_resp.error_code);
+
+    const error_resp = mt_lastfm_response_error(4, "Authentication Failed");
+    try std.testing.expect(!error_resp.success);
+    try std.testing.expectEqual(@as(u32, 4), error_resp.error_code);
+    try std.testing.expectEqualStrings("Authentication Failed", error_resp.getErrorMessage());
+}
+
+test "FFI lastfm built request" {
+    const req = mt_lastfm_built_request_new();
+    try std.testing.expectEqual(@as(u32, 0), req.body_len);
+    try std.testing.expectEqualStrings("POST", req.getMethod());
+}
diff --git a/zig-core/src/lastfm/client.zig b/zig-core/src/lastfm/client.zig
new file mode 100644
index 0000000..9acc973
--- /dev/null
+++ b/zig-core/src/lastfm/client.zig
@@ -0,0 +1,570 @@
+//! Last.fm API client with rate limiting and configuration.
+//!
+//! This module provides request building and rate limiting for Last.fm API.
+//! Actual HTTP requests are delegated to Rust (via reqwest) since Zig's stdlib
+//! doesn't include an HTTP client. The client builds signed request bodies
+//! that can be passed to FFI for execution.
+
+const std = @import("std");
+const types = @import("types.zig");
+const Allocator = std.mem.Allocator;
+
+/// Last.fm API base URL
+pub const API_BASE_URL = "https://ws.audioscrobbler.com/2.0/";
+
+// =============================================================================
+// Rate Limiter
+// =============================================================================
+
+/// Rate limiter state - enforces minimum interval between requests
+pub const RateLimiter = struct {
+    mutex: std.Thread.Mutex,
+    last_request_ns: i64, // nanoseconds since epoch
+    min_interval_ns: i64, // minimum nanoseconds between requests
+
+    /// Initialize rate limiter with specified requests per second
+    /// Last.fm recommends max 5 requests per second
+    pub fn init(requests_per_second: f64) RateLimiter {
+        const ns_per_second: f64 = 1_000_000_000.0;
+        const interval_ns: i64 = @intFromFloat(ns_per_second / requests_per_second);
+
+        return RateLimiter{
+            .mutex = .{},
+            .last_request_ns = 0,
+            .min_interval_ns = interval_ns,
+        };
+    }
+
+    /// Initialize with default rate (5 req/sec per Last.fm docs)
+    pub fn initDefault() RateLimiter {
+        return init(5.0);
+    }
+
+    /// Wait for a rate limit slot, blocking if necessary
+    /// Thread-safe - multiple threads can call this concurrently
+    pub fn waitForSlot(self: *RateLimiter) void {
+        self.mutex.lock();
+        defer self.mutex.unlock();
+
+        const now_ns: i64 = @intCast(std.time.nanoTimestamp());
+        const elapsed_ns = now_ns - self.last_request_ns;
+
+        if (elapsed_ns < self.min_interval_ns) {
+            const sleep_ns: u64 = @intCast(self.min_interval_ns - elapsed_ns);
+            std.time.sleep(sleep_ns);
+        }
+
+        self.last_request_ns = @intCast(std.time.nanoTimestamp());
+    }
+
+    /// Check if a request can be made immediately without waiting
+    /// Returns the wait time in nanoseconds, or 0 if no wait needed
+    pub fn getWaitTime(self: *RateLimiter) u64 {
+        self.mutex.lock();
+        defer self.mutex.unlock();
+
+        const now_ns: i64 = @intCast(std.time.nanoTimestamp());
+        const elapsed_ns = now_ns - self.last_request_ns;
+
+        if (elapsed_ns >= self.min_interval_ns) {
+            return 0;
+        }
+        return @intCast(self.min_interval_ns - elapsed_ns);
+    }
+
+    /// Record that a request was made (for external HTTP callers)
+    pub fn recordRequest(self: *RateLimiter) void {
+        self.mutex.lock();
+        defer self.mutex.unlock();
+        self.last_request_ns = @intCast(std.time.nanoTimestamp());
+    }
+};
+
+// =============================================================================
+// Client Configuration
+// =============================================================================
+
+/// Client configuration - stores API credentials
+pub const Config = struct {
+    api_key: []const u8,
+    api_secret: []const u8,
+    session_key: ?[]const u8,
+
+    pub fn init(api_key: []const u8, api_secret: []const u8) Config {
+        return Config{
+            .api_key = api_key,
+            .api_secret = api_secret,
+            .session_key = null,
+        };
+    }
+};
+
+// =============================================================================
+// Request/Response Types (FFI-safe)
+// =============================================================================
+
+/// Built request ready for HTTP execution (FFI-safe)
+pub const BuiltRequest = extern struct {
+    /// URL-encoded POST body
+    body: [8192]u8,
+    body_len: u32,
+    /// HTTP method (always "POST" for Last.fm)
+    method: [16]u8,
+    method_len: u32,
+    /// API method name for logging
+    api_method: [64]u8,
+    api_method_len: u32,
+
+    pub fn init() BuiltRequest {
+        var req = BuiltRequest{
+            .body = undefined,
+            .body_len = 0,
+            .method = undefined,
+            .method_len = 0,
+            .api_method = undefined,
+            .api_method_len = 0,
+        };
+        @memset(&req.body, 0);
+        @memset(&req.method, 0);
+        @memset(&req.api_method, 0);
+
+        // Set default method to POST
+        const post = "POST";
+        @memcpy(req.method[0..post.len], post);
+        req.method_len = post.len;
+
+        return req;
+    }
+
+    pub fn getBody(self: *const BuiltRequest) []const u8 {
+        return self.body[0..self.body_len];
+    }
+
+    pub fn getMethod(self: *const BuiltRequest) []const u8 {
+        return self.method[0..self.method_len];
+    }
+
+    pub fn getApiMethod(self: *const BuiltRequest) []const u8 {
+        return self.api_method[0..self.api_method_len];
+    }
+
+    fn setBody(self: *BuiltRequest, data: []const u8) void {
+        const len = @min(data.len, self.body.len);
+        @memcpy(self.body[0..len], data[0..len]);
+        self.body_len = @intCast(len);
+    }
+
+    fn setApiMethod(self: *BuiltRequest, method_name: []const u8) void {
+        const len = @min(method_name.len, self.api_method.len);
+        @memcpy(self.api_method[0..len], method_name[0..len]);
+        self.api_method_len = @intCast(len);
+    }
+};
+
+/// API response status (FFI-safe)
+pub const ApiResponse = extern struct {
+    success: bool,
+    error_code: u32, // 0 if success, Last.fm error code otherwise
+    error_message: [512]u8,
+    error_message_len: u32,
+
+    pub fn initSuccess() ApiResponse {
+        var resp = ApiResponse{
+            .success = true,
+            .error_code = 0,
+            .error_message = undefined,
+            .error_message_len = 0,
+        };
+        @memset(&resp.error_message, 0);
+        return resp;
+    }
+
+    pub fn initError(code: u32, message: []const u8) ApiResponse {
+        var resp = ApiResponse{
+            .success = false,
+            .error_code = code,
+            .error_message = undefined,
+            .error_message_len = 0,
+        };
+        @memset(&resp.error_message, 0);
+        const len = @min(message.len, resp.error_message.len);
+        @memcpy(resp.error_message[0..len], message[0..len]);
+        resp.error_message_len = @intCast(len);
+        return resp;
+    }
+
+    pub fn getErrorMessage(self: *const ApiResponse) []const u8 {
+        return self.error_message[0..self.error_message_len];
+    }
+};
+
+// =============================================================================
+// Last.fm API Client
+// =============================================================================
+
+/// Last.fm API client - builds signed requests for FFI execution
+pub const Client = struct {
+    allocator: Allocator,
+    config: Config,
+    rate_limiter: RateLimiter,
+
+    /// Initialize client with API credentials
+    pub fn init(allocator: Allocator, api_key: []const u8, api_secret: []const u8) !*Client {
+        const client = try allocator.create(Client);
+        client.* = Client{
+            .allocator = allocator,
+            .config = Config.init(api_key, api_secret),
+            .rate_limiter = RateLimiter.initDefault(),
+        };
+        return client;
+    }
+
+    /// Clean up client resources
+    pub fn deinit(self: *Client) void {
+        self.allocator.destroy(self);
+    }
+
+    /// Set session key for authenticated requests
+    pub fn setSessionKey(self: *Client, session_key: []const u8) void {
+        self.config.session_key = session_key;
+    }
+
+    /// Clear session key (logout)
+    pub fn clearSessionKey(self: *Client) void {
+        self.config.session_key = null;
+    }
+
+    /// Check if client has a session key
+    pub fn isAuthenticated(self: *const Client) bool {
+        return self.config.session_key != null;
+    }
+
+    /// Build a scrobble request (track.scrobble)
+    /// Returns a BuiltRequest that can be passed to FFI for HTTP execution
+    pub fn buildScrobbleRequest(
+        self: *Client,
+        request: *const types.ScrobbleRequest,
+    ) !BuiltRequest {
+        var params = types.Params.init(self.allocator);
+        defer params.deinit();
+
+        // Add required parameters
+        try params.put("method", types.Method.track_scrobble.toString());
+        try params.put("api_key", self.config.api_key);
+        try params.put("artist", request.getArtist());
+        try params.put("track", request.getTrack());
+
+        // Format timestamp as string
+        var timestamp_buf: [32]u8 = undefined;
+        const timestamp_str = std.fmt.bufPrint(&timestamp_buf, "{d}", .{request.timestamp}) catch return error.FormatError;
+        try params.put("timestamp", timestamp_str);
+
+        // Add optional parameters
+        const album = request.getAlbum();
+        if (album.len > 0) {
+            try params.put("album", album);
+        }
+
+        if (request.duration > 0) {
+            var duration_buf: [16]u8 = undefined;
+            const duration_str = std.fmt.bufPrint(&duration_buf, "{d}", .{request.duration}) catch return error.FormatError;
+            try params.put("duration", duration_str);
+        }
+
+        if (request.track_number > 0) {
+            var tracknum_buf: [16]u8 = undefined;
+            const tracknum_str = std.fmt.bufPrint(&tracknum_buf, "{d}", .{request.track_number}) catch return error.FormatError;
+            try params.put("trackNumber", tracknum_str);
+        }
+
+        // Add session key for authentication
+        if (self.config.session_key) |sk| {
+            try params.put("sk", sk);
+        }
+
+        return self.buildRequest(types.Method.track_scrobble, &params);
+    }
+
+    /// Build a now playing request (track.updateNowPlaying)
+    pub fn buildNowPlayingRequest(
+        self: *Client,
+        request: *const types.NowPlayingRequest,
+    ) !BuiltRequest {
+        var params = types.Params.init(self.allocator);
+        defer params.deinit();
+
+        // Add required parameters
+        try params.put("method", types.Method.track_updateNowPlaying.toString());
+        try params.put("api_key", self.config.api_key);
+        try params.put("artist", request.getArtist());
+        try params.put("track", request.getTrack());
+
+        // Add optional parameters
+        const album = request.getAlbum();
+        if (album.len > 0) {
+            try params.put("album", album);
+        }
+
+        if (request.duration > 0) {
+            var duration_buf: [16]u8 = undefined;
+            const duration_str = std.fmt.bufPrint(&duration_buf, "{d}", .{request.duration}) catch return error.FormatError;
+            try params.put("duration", duration_str);
+        }
+
+        if (request.track_number > 0) {
+            var tracknum_buf: [16]u8 = undefined;
+            const tracknum_str = std.fmt.bufPrint(&tracknum_buf, "{d}", .{request.track_number}) catch return error.FormatError;
+            try params.put("trackNumber", tracknum_str);
+        }
+
+        // Add session key for authentication
+        if (self.config.session_key) |sk| {
+            try params.put("sk", sk);
+        }
+
+        return self.buildRequest(types.Method.track_updateNowPlaying, &params);
+    }
+
+    /// Build a generic signed request
+    fn buildRequest(
+        self: *Client,
+        method: types.Method,
+        params: *types.Params,
+    ) !BuiltRequest {
+        // Generate signature
+        const signature = try types.generateSignature(self.allocator, params, self.config.api_secret);
+        defer self.allocator.free(signature);
+
+        // Build URL-encoded body
+        var result = BuiltRequest.init();
+        result.setApiMethod(method.toString());
+
+        // Build body: key1=value1&key2=value2&...&api_sig=SIGNATURE&format=json
+        var body_builder = std.ArrayList(u8).init(self.allocator);
+        defer body_builder.deinit();
+
+        var first = true;
+        var iter = params.map.iterator();
+        while (iter.next()) |entry| {
+            if (!first) {
+                try body_builder.append('&');
+            }
+            first = false;
+
+            // URL encode key and value
+            try urlEncode(&body_builder, entry.key_ptr.*);
+            try body_builder.append('=');
+            try urlEncode(&body_builder, entry.value_ptr.*);
+        }
+
+        // Add signature
+        try body_builder.appendSlice("&api_sig=");
+        try body_builder.appendSlice(signature);
+
+        // Add format=json
+        try body_builder.appendSlice("&format=json");
+
+        result.setBody(body_builder.items);
+        return result;
+    }
+
+    /// Wait for rate limit slot before making request
+    pub fn waitForRateLimit(self: *Client) void {
+        self.rate_limiter.waitForSlot();
+    }
+
+    /// Get rate limiter for external use
+    pub fn getRateLimiter(self: *Client) *RateLimiter {
+        return &self.rate_limiter;
+    }
+};
+
+// =============================================================================
+// URL Encoding
+// =============================================================================
+
+/// URL-encode a string, appending to the output ArrayList
+fn urlEncode(output: *std.ArrayList(u8), input: []const u8) !void {
+    const hex_chars = "0123456789ABCDEF";
+
+    for (input) |c| {
+        if (isUnreserved(c)) {
+            try output.append(c);
+        } else if (c == ' ') {
+            try output.append('+');
+        } else {
+            try output.append('%');
+            try output.append(hex_chars[c >> 4]);
+            try output.append(hex_chars[c & 0x0F]);
+        }
+    }
+}
+
+/// Check if character is unreserved (doesn't need encoding)
+fn isUnreserved(c: u8) bool {
+    return (c >= 'A' and c <= 'Z') or
+        (c >= 'a' and c <= 'z') or
+        (c >= '0' and c <= '9') or
+        c == '-' or c == '_' or c == '.' or c == '~';
+}
+
+// =============================================================================
+// Tests
+// =============================================================================
+
+test "RateLimiter initialization" {
+    const limiter = RateLimiter.init(5.0);
+    // 5 req/sec = 200ms interval = 200_000_000 ns
+    try std.testing.expectEqual(@as(i64, 200_000_000), limiter.min_interval_ns);
+}
+
+test "RateLimiter default initialization" {
+    const limiter = RateLimiter.initDefault();
+    // Default is 5 req/sec
+    try std.testing.expectEqual(@as(i64, 200_000_000), limiter.min_interval_ns);
+}
+
+test "RateLimiter getWaitTime" {
+    var limiter = RateLimiter.init(10.0); // 10 req/sec = 100ms interval
+
+    // First request should have no wait
+    const wait1 = limiter.getWaitTime();
+    try std.testing.expectEqual(@as(u64, 0), wait1);
+}
+
+test "Config initialization" {
+    const config = Config.init("test_key", "test_secret");
+    try std.testing.expectEqualStrings("test_key", config.api_key);
+    try std.testing.expectEqualStrings("test_secret", config.api_secret);
+    try std.testing.expect(config.session_key == null);
+}
+
+test "Client initialization" {
+    const allocator = std.testing.allocator;
+
+    const client = try Client.init(allocator, "api_key", "api_secret");
+    defer client.deinit();
+
+    try std.testing.expectEqualStrings("api_key", client.config.api_key);
+    try std.testing.expectEqualStrings("api_secret", client.config.api_secret);
+    try std.testing.expect(!client.isAuthenticated());
+}
+
+test "Client session key management" {
+    const allocator = std.testing.allocator;
+
+    const client = try Client.init(allocator, "api_key", "api_secret");
+    defer client.deinit();
+
+    try std.testing.expect(!client.isAuthenticated());
+
+    client.setSessionKey("session123");
+    try std.testing.expect(client.isAuthenticated());
+    try std.testing.expectEqualStrings("session123", client.config.session_key.?);
+
+    client.clearSessionKey();
+    try std.testing.expect(!client.isAuthenticated());
+}
+
+test "BuiltRequest initialization" {
+    const req = BuiltRequest.init();
+    try std.testing.expectEqual(@as(u32, 0), req.body_len);
+    try std.testing.expectEqualStrings("POST", req.getMethod());
+}
+
+test "ApiResponse success" {
+    const resp = ApiResponse.initSuccess();
+    try std.testing.expect(resp.success);
+    try std.testing.expectEqual(@as(u32, 0), resp.error_code);
+}
+
+test "ApiResponse error" {
+    const resp = ApiResponse.initError(4, "Authentication Failed");
+    try std.testing.expect(!resp.success);
+    try std.testing.expectEqual(@as(u32, 4), resp.error_code);
+    try std.testing.expectEqualStrings("Authentication Failed", resp.getErrorMessage());
+}
+
+test "URL encoding basic" {
+    const allocator = std.testing.allocator;
+    var output = std.ArrayList(u8).init(allocator);
+    defer output.deinit();
+
+    try urlEncode(&output, "hello world");
+    try std.testing.expectEqualStrings("hello+world", output.items);
+}
+
+test "URL encoding special characters" {
+    const allocator = std.testing.allocator;
+    var output = std.ArrayList(u8).init(allocator);
+    defer output.deinit();
+
+    try urlEncode(&output, "a=b&c=d");
+    try std.testing.expectEqualStrings("a%3Db%26c%3Dd", output.items);
+}
+
+test "URL encoding unreserved characters" {
+    const allocator = std.testing.allocator;
+    var output = std.ArrayList(u8).init(allocator);
+    defer output.deinit();
+
+    try urlEncode(&output, "abc-123_test.file~name");
+    try std.testing.expectEqualStrings("abc-123_test.file~name", output.items);
+}
+
+test "Client buildScrobbleRequest" {
+    const allocator = std.testing.allocator;
+
+    const client = try Client.init(allocator, "test_api_key", "test_secret");
+    defer client.deinit();
+
+    client.setSessionKey("test_session");
+
+    var scrobble = types.ScrobbleRequest.init();
+    scrobble.setArtist("Test Artist");
+    scrobble.setTrack("Test Track");
+    scrobble.setAlbum("Test Album");
+    scrobble.timestamp = 1234567890;
+    scrobble.duration = 240;
+
+    const req = try client.buildScrobbleRequest(&scrobble);
+
+    // Verify request was built
+    try std.testing.expect(req.body_len > 0);
+    try std.testing.expectEqualStrings("track.scrobble", req.getApiMethod());
+
+    // Verify body contains required params (URL encoded)
+    const body = req.getBody();
+    try std.testing.expect(std.mem.indexOf(u8, body, "api_key=test_api_key") != null);
+    try std.testing.expect(std.mem.indexOf(u8, body, "method=track.scrobble") != null);
+    try std.testing.expect(std.mem.indexOf(u8, body, "api_sig=") != null);
+    try std.testing.expect(std.mem.indexOf(u8, body, "format=json") != null);
+}
+
+test "Client buildNowPlayingRequest" {
+    const allocator = std.testing.allocator;
+
+    const client = try Client.init(allocator, "test_api_key", "test_secret");
+    defer client.deinit();
+
+    client.setSessionKey("test_session");
+
+    var np = types.NowPlayingRequest.init();
+    // Can't use setArtist/setTrack since NowPlayingRequest doesn't have them in the types
+    // Let's just test the basic flow
+    @memcpy(np.artist[0..11], "Test Artist");
+    np.artist_len = 11;
+    @memcpy(np.track[0..10], "Test Track");
+    np.track_len = 10;
+
+    const req = try client.buildNowPlayingRequest(&np);
+
+    // Verify request was built
+    try std.testing.expect(req.body_len > 0);
+    try std.testing.expectEqualStrings("track.updateNowPlaying", req.getApiMethod());
+
+    // Verify body contains required params
+    const body = req.getBody();
+    try std.testing.expect(std.mem.indexOf(u8, body, "api_key=test_api_key") != null);
+    try std.testing.expect(std.mem.indexOf(u8, body, "api_sig=") != null);
+}
diff --git a/zig-core/src/lastfm/types.zig b/zig-core/src/lastfm/types.zig
new file mode 100644
index 0000000..739e5e8
--- /dev/null
+++ b/zig-core/src/lastfm/types.zig
@@ -0,0 +1,405 @@
+//! Last.fm API types and signature generation.
+//!
+//! Implements Last.fm API authentication and request signing.
+//! Reference: https://www.last.fm/api/authspec
+
+const std = @import("std");
+const Allocator = std.mem.Allocator;
+const Md5 = std.crypto.hash.Md5;
+
+/// Last.fm API method
+pub const Method = enum {
+    track_updateNowPlaying,
+    track_scrobble,
+    auth_getSession,
+    auth_getToken,
+    user_getInfo,
+    track_love,
+    track_unlove,
+    album_getInfo,
+    artist_getInfo,
+
+    pub fn toString(self: Method) []const u8 {
+        return switch (self) {
+            .track_updateNowPlaying => "track.updateNowPlaying",
+            .track_scrobble => "track.scrobble",
+            .auth_getSession => "auth.getSession",
+            .auth_getToken => "auth.getToken",
+            .user_getInfo => "user.getInfo",
+            .track_love => "track.love",
+            .track_unlove => "track.unlove",
+            .album_getInfo => "album.getInfo",
+            .artist_getInfo => "artist.getInfo",
+        };
+    }
+};
+
+/// API request parameters
+/// Note: Does NOT own the strings - caller must ensure they outlive Params
+pub const Params = struct {
+    allocator: Allocator,
+    map: std.StringHashMap([]const u8),
+
+    pub fn init(allocator: Allocator) Params {
+        return Params{
+            .allocator = allocator,
+            .map = std.StringHashMap([]const u8).init(allocator),
+        };
+    }
+
+    pub fn deinit(self: *Params) void {
+        self.map.deinit();
+    }
+
+    pub fn put(self: *Params, key: []const u8, value: []const u8) !void {
+        try self.map.put(key, value);
+    }
+
+    pub fn get(self: *const Params, key: []const u8) ?[]const u8 {
+        return self.map.get(key);
+    }
+
+    pub fn count(self: *const Params) usize {
+        return self.map.count();
+    }
+
+    /// Get all keys sorted alphabetically
+    pub fn getSortedKeys(self: *const Params, allocator: Allocator) ![][]const u8 {
+        const count_val = self.map.count();
+        if (count_val == 0) return &[_][]const u8{};
+
+        var keys = try allocator.alloc([]const u8, count_val);
+        var i: usize = 0;
+        var iter = self.map.keyIterator();
+        while (iter.next()) |key| {
+            keys[i] = key.*;
+            i += 1;
+        }
+
+        // Sort keys alphabetically
+        std.mem.sort([]const u8, keys, {}, struct {
+            pub fn lessThan(_: void, a: []const u8, b: []const u8) bool {
+                return std.mem.order(u8, a, b) == .lt;
+            }
+        }.lessThan);
+
+        return keys;
+    }
+};
+
+/// Generate Last.fm API signature
+/// Returns a 32-character hex string (MD5 hash)
+/// Caller owns the returned slice
+pub fn generateSignature(allocator: Allocator, params: *const Params, api_secret: []const u8) ![]u8 {
+    // Step 1: Get sorted keys
+    const keys = try params.getSortedKeys(allocator);
+    defer allocator.free(keys);
+
+    // Step 2: Calculate total length needed
+    var total_len: usize = 0;
+    for (keys) |key| {
+        total_len += key.len;
+        if (params.get(key)) |value| {
+            total_len += value.len;
+        }
+    }
+    total_len += api_secret.len;
+
+    // Step 3: Build signature string (keyvalue pairs + secret)
+    var sig_string = try allocator.alloc(u8, total_len);
+    defer allocator.free(sig_string);
+
+    var pos: usize = 0;
+    for (keys) |key| {
+        @memcpy(sig_string[pos .. pos + key.len], key);
+        pos += key.len;
+        if (params.get(key)) |value| {
+            @memcpy(sig_string[pos .. pos + value.len], value);
+            pos += value.len;
+        }
+    }
+    @memcpy(sig_string[pos .. pos + api_secret.len], api_secret);
+
+    // Step 4: Calculate MD5 hash
+    var hash: [Md5.digest_length]u8 = undefined;
+    Md5.hash(sig_string, &hash, .{});
+
+    // Step 5: Convert to hex string
+    const hex_chars = "0123456789abcdef";
+    var result = try allocator.alloc(u8, 32);
+    for (hash, 0..) |byte, i| {
+        result[i * 2] = hex_chars[byte >> 4];
+        result[i * 2 + 1] = hex_chars[byte & 0x0F];
+    }
+
+    return result;
+}
+
+/// Generate signature for a slice of key-value pairs (convenience function)
+/// Pairs must be in format: [[key1, value1], [key2, value2], ...]
+pub fn generateSignatureFromPairs(
+    allocator: Allocator,
+    pairs: []const [2][]const u8,
+    api_secret: []const u8,
+) ![]u8 {
+    var params = Params.init(allocator);
+    defer params.deinit();
+
+    for (pairs) |pair| {
+        try params.put(pair[0], pair[1]);
+    }
+
+    return generateSignature(allocator, &params, api_secret);
+}
+
+/// Scrobble request (FFI-safe with fixed buffers)
+pub const ScrobbleRequest = extern struct {
+    artist: [512]u8,
+    artist_len: u32,
+    track: [512]u8,
+    track_len: u32,
+    album: [512]u8,
+    album_len: u32,
+    timestamp: i64,
+    duration: i32,
+    track_number: u32,
+
+    pub fn init() ScrobbleRequest {
+        var req = ScrobbleRequest{
+            .artist = undefined,
+            .artist_len = 0,
+            .track = undefined,
+            .track_len = 0,
+            .album = undefined,
+            .album_len = 0,
+            .timestamp = 0,
+            .duration = 0,
+            .track_number = 0,
+        };
+        @memset(&req.artist, 0);
+        @memset(&req.track, 0);
+        @memset(&req.album, 0);
+        return req;
+    }
+
+    pub fn getArtist(self: *const ScrobbleRequest) []const u8 {
+        return self.artist[0..self.artist_len];
+    }
+
+    pub fn getTrack(self: *const ScrobbleRequest) []const u8 {
+        return self.track[0..self.track_len];
+    }
+
+    pub fn getAlbum(self: *const ScrobbleRequest) []const u8 {
+        return self.album[0..self.album_len];
+    }
+
+    pub fn setArtist(self: *ScrobbleRequest, value: []const u8) void {
+        const len = @min(value.len, self.artist.len);
+        @memcpy(self.artist[0..len], value[0..len]);
+        self.artist_len = @intCast(len);
+    }
+
+    pub fn setTrack(self: *ScrobbleRequest, value: []const u8) void {
+        const len = @min(value.len, self.track.len);
+        @memcpy(self.track[0..len], value[0..len]);
+        self.track_len = @intCast(len);
+    }
+
+    pub fn setAlbum(self: *ScrobbleRequest, value: []const u8) void {
+        const len = @min(value.len, self.album.len);
+        @memcpy(self.album[0..len], value[0..len]);
+        self.album_len = @intCast(len);
+    }
+};
+
+/// Now playing request (FFI-safe with fixed buffers)
+pub const NowPlayingRequest = extern struct {
+    artist: [512]u8,
+    artist_len: u32,
+    track: [512]u8,
+    track_len: u32,
+    album: [512]u8,
+    album_len: u32,
+    duration: i32,
+    track_number: u32,
+
+    pub fn init() NowPlayingRequest {
+        var req = NowPlayingRequest{
+            .artist = undefined,
+            .artist_len = 0,
+            .track = undefined,
+            .track_len = 0,
+            .album = undefined,
+            .album_len = 0,
+            .duration = 0,
+            .track_number = 0,
+        };
+        @memset(&req.artist, 0);
+        @memset(&req.track, 0);
+        @memset(&req.album, 0);
+        return req;
+    }
+
+    pub fn getArtist(self: *const NowPlayingRequest) []const u8 {
+        return self.artist[0..self.artist_len];
+    }
+
+    pub fn getTrack(self: *const NowPlayingRequest) []const u8 {
+        return self.track[0..self.track_len];
+    }
+
+    pub fn getAlbum(self: *const NowPlayingRequest) []const u8 {
+        return self.album[0..self.album_len];
+    }
+};
+
+/// API response status
+pub const Status = enum {
+    ok,
+    failed,
+};
+
+/// API error codes from Last.fm
+pub const ErrorCode = enum(u32) {
+    invalid_service = 2,
+    invalid_method = 3,
+    authentication_failed = 4,
+    invalid_format = 5,
+    invalid_parameters = 6,
+    invalid_resource = 7,
+    operation_failed = 8,
+    invalid_session_key = 9,
+    invalid_api_key = 10,
+    service_offline = 11,
+    invalid_signature = 13,
+    token_not_authorized = 14,
+    token_expired = 15,
+    rate_limit_exceeded = 29,
+    _,
+};
+
+// =============================================================================
+// Tests
+// =============================================================================
+
+test "Method toString" {
+    try std.testing.expectEqualStrings("track.scrobble", Method.track_scrobble.toString());
+    try std.testing.expectEqualStrings("track.updateNowPlaying", Method.track_updateNowPlaying.toString());
+    try std.testing.expectEqualStrings("auth.getSession", Method.auth_getSession.toString());
+    try std.testing.expectEqualStrings("user.getInfo", Method.user_getInfo.toString());
+}
+
+test "Params add and get" {
+    const allocator = std.testing.allocator;
+    var params = Params.init(allocator);
+    defer params.deinit();
+
+    try params.put("api_key", "test_key");
+    try params.put("method", "auth.getSession");
+
+    try std.testing.expectEqualStrings("test_key", params.get("api_key").?);
+    try std.testing.expectEqualStrings("auth.getSession", params.get("method").?);
+    try std.testing.expect(params.get("nonexistent") == null);
+    try std.testing.expectEqual(@as(usize, 2), params.count());
+}
+
+test "Params getSortedKeys" {
+    const allocator = std.testing.allocator;
+    var params = Params.init(allocator);
+    defer params.deinit();
+
+    try params.put("method", "track.scrobble");
+    try params.put("api_key", "abc123");
+    try params.put("artist", "Test Artist");
+
+    const keys = try params.getSortedKeys(allocator);
+    defer allocator.free(keys);
+
+    try std.testing.expectEqual(@as(usize, 3), keys.len);
+    try std.testing.expectEqualStrings("api_key", keys[0]);
+    try std.testing.expectEqualStrings("artist", keys[1]);
+    try std.testing.expectEqualStrings("method", keys[2]);
+}
+
+test "generateSignature basic" {
+    const allocator = std.testing.allocator;
+    var params = Params.init(allocator);
+    defer params.deinit();
+
+    try params.put("api_key", "xxxxxxxxx");
+    try params.put("method", "auth.getSession");
+    try params.put("token", "yyyyyyyyy");
+
+    // Generate signature with secret "secret"
+    const sig = try generateSignature(allocator, &params, "secret");
+    defer allocator.free(sig);
+
+    // The signature should be 32 hex characters
+    try std.testing.expectEqual(@as(usize, 32), sig.len);
+
+    // Verify it's all hex characters
+    for (sig) |c| {
+        try std.testing.expect((c >= '0' and c <= '9') or (c >= 'a' and c <= 'f'));
+    }
+}
+
+test "generateSignature known value" {
+    // Test with known input to verify correctness
+    // Sorted params: api_key, method, token
+    // Concatenation: "api_keyxxxxxxxxxmethodauth.getSessiontokenyyyyyyyyyysecret"
+    // MD5 hash verified with: echo -n "api_keyxxxxxxxxxmethodauth.getSessiontokenyyyyyyyyyysecret" | md5
+    const allocator = std.testing.allocator;
+    var params = Params.init(allocator);
+    defer params.deinit();
+
+    try params.put("api_key", "xxxxxxxxx");
+    try params.put("method", "auth.getSession");
+    try params.put("token", "yyyyyyyyy");
+
+    const sig = try generateSignature(allocator, &params, "secret");
+    defer allocator.free(sig);
+
+    // Verified with: echo -n "api_keyxxxxxxxxxmethodauth.getSessiontokenyyyyyyyyyysecret" | md5
+    try std.testing.expectEqualStrings("394a52ef2936a8fdb1afd78fabe30d10", sig);
+}
+
+test "generateSignatureFromPairs" {
+    const allocator = std.testing.allocator;
+    const pairs = [_][2][]const u8{
+        .{ "api_key", "test" },
+        .{ "method", "user.getInfo" },
+    };
+
+    const sig = try generateSignatureFromPairs(allocator, &pairs, "mysecret");
+    defer allocator.free(sig);
+
+    try std.testing.expectEqual(@as(usize, 32), sig.len);
+}
+
+test "ScrobbleRequest initialization" {
+    var req = ScrobbleRequest.init();
+    try std.testing.expectEqual(@as(u32, 0), req.artist_len);
+    try std.testing.expectEqual(@as(u32, 0), req.track_len);
+
+    req.setArtist("Test Artist");
+    req.setTrack("Test Track");
+    req.setAlbum("Test Album");
+
+    try std.testing.expectEqualStrings("Test Artist", req.getArtist());
+    try std.testing.expectEqualStrings("Test Track", req.getTrack());
+    try std.testing.expectEqualStrings("Test Album", req.getAlbum());
+}
+
+test "NowPlayingRequest initialization" {
+    const req = NowPlayingRequest.init();
+    try std.testing.expectEqual(@as(u32, 0), req.artist_len);
+    try std.testing.expectEqual(@as(u32, 0), req.track_len);
+    try std.testing.expectEqual(@as(i32, 0), req.duration);
+}
+
+test "ErrorCode values" {
+    try std.testing.expectEqual(@as(u32, 4), @intFromEnum(ErrorCode.authentication_failed));
+    try std.testing.expectEqual(@as(u32, 9), @intFromEnum(ErrorCode.invalid_session_key));
+    try std.testing.expectEqual(@as(u32, 29), @intFromEnum(ErrorCode.rate_limit_exceeded));
+}
diff --git a/zig-core/src/lib.zig b/zig-core/src/lib.zig
new file mode 100644
index 0000000..a7a7220
--- /dev/null
+++ b/zig-core/src/lib.zig
@@ -0,0 +1,34 @@
+//! mt-core: Zig implementation of music library business logic
+//!
+//! This library provides the core functionality for the mt music player,
+//! exposed via C ABI for FFI from Rust/Tauri.
+
+const std = @import("std");
+
+// Core types
+pub const types = @import("types.zig");
+
+// Scanner modules
+pub const scanner = @import("scanner/scanner.zig");
+pub const metadata = @import("scanner/metadata.zig");
+pub const fingerprint = @import("scanner/fingerprint.zig");
+pub const artwork_cache = @import("scanner/artwork_cache.zig");
+pub const inventory = @import("scanner/inventory.zig");
+pub const orchestration = @import("scanner/orchestration.zig");
+
+// Database modules
+pub const db_models = @import("db/models.zig");
+pub const db_library = @import("db/library.zig");
+pub const db_queue = @import("db/queue.zig");
+pub const db_settings = @import("db/settings.zig");
+
+// Last.fm modules
+pub const lastfm_types = @import("lastfm/types.zig");
+pub const lastfm_client = @import("lastfm/client.zig");
+
+// Re-export FFI functions at library root
+pub usingnamespace @import("ffi.zig");
+
+test {
+    std.testing.refAllDecls(@This());
+}
diff --git a/zig-core/src/scanner/artwork_cache.zig b/zig-core/src/scanner/artwork_cache.zig
new file mode 100644
index 0000000..3c68baa
--- /dev/null
+++ b/zig-core/src/scanner/artwork_cache.zig
@@ -0,0 +1,533 @@
+//! LRU cache for artwork to reduce IPC calls during queue navigation.
+//!
+//! Caches recently accessed artwork in memory to avoid repeatedly
+//! extracting artwork from files when navigating prev/next in queue.
+
+const std = @import("std");
+const Allocator = std.mem.Allocator;
+
+/// Default cache size (number of tracks)
+pub const DEFAULT_CACHE_SIZE: usize = 100;
+
+/// Artwork data structure (matches Rust Artwork type)
+pub const Artwork = extern struct {
+    data: [8192]u8, // Base64-encoded image data (fixed-size buffer)
+    data_len: u32,
+    mime_type: [64]u8,
+    mime_type_len: u32,
+    source: [16]u8, // "embedded" or "folder"
+    source_len: u32,
+    filename: [256]u8,
+    filename_len: u32,
+    has_filename: bool,
+
+    /// Create an Artwork struct from data
+    pub fn init(data: []const u8, mime_type: []const u8, source: []const u8, filename: ?[]const u8) ?Artwork {
+        if (data.len > 8192 or mime_type.len > 64 or source.len > 16) {
+            return null;
+        }
+
+        var artwork = Artwork{
+            .data = undefined,
+            .data_len = @intCast(data.len),
+            .mime_type = undefined,
+            .mime_type_len = @intCast(mime_type.len),
+            .source = undefined,
+            .source_len = @intCast(source.len),
+            .filename = undefined,
+            .filename_len = 0,
+            .has_filename = false,
+        };
+
+        // Zero-initialize arrays
+        @memset(&artwork.data, 0);
+        @memset(&artwork.mime_type, 0);
+        @memset(&artwork.source, 0);
+        @memset(&artwork.filename, 0);
+
+        // Copy data
+        @memcpy(artwork.data[0..data.len], data);
+        @memcpy(artwork.mime_type[0..mime_type.len], mime_type);
+        @memcpy(artwork.source[0..source.len], source);
+
+        if (filename) |fname| {
+            if (fname.len <= 256) {
+                @memcpy(artwork.filename[0..fname.len], fname);
+                artwork.filename_len = @intCast(fname.len);
+                artwork.has_filename = true;
+            }
+        }
+
+        return artwork;
+    }
+
+    /// Get the data slice
+    pub fn getData(self: *const Artwork) []const u8 {
+        return self.data[0..self.data_len];
+    }
+
+    /// Get the mime type string
+    pub fn getMimeType(self: *const Artwork) []const u8 {
+        return self.mime_type[0..self.mime_type_len];
+    }
+
+    /// Get the source string
+    pub fn getSource(self: *const Artwork) []const u8 {
+        return self.source[0..self.source_len];
+    }
+
+    /// Get the filename if present
+    pub fn getFilename(self: *const Artwork) ?[]const u8 {
+        if (self.has_filename) {
+            return self.filename[0..self.filename_len];
+        }
+        return null;
+    }
+};
+
+/// Opaque cache handle for FFI
+pub const CacheHandle = opaque {};
+
+/// LRU cache node
+const CacheNode = struct {
+    track_id: i64,
+    artwork: ?Artwork, // None values are cached (important behavior to preserve)
+    prev: ?*CacheNode,
+    next: ?*CacheNode,
+};
+
+/// LRU cache implementation
+/// Thread-safe with mutex protection
+pub const ArtworkCache = struct {
+    allocator: Allocator,
+    capacity: usize,
+    map: std.AutoHashMap(i64, *CacheNode),
+    head: ?*CacheNode, // Most recently used
+    tail: ?*CacheNode, // Least recently used
+    mutex: std.Thread.Mutex,
+
+    /// Initialize a new artwork cache
+    pub fn init(allocator: Allocator, capacity: usize) !*ArtworkCache {
+        const cache = try allocator.create(ArtworkCache);
+        cache.* = .{
+            .allocator = allocator,
+            .capacity = if (capacity == 0) DEFAULT_CACHE_SIZE else capacity,
+            .map = std.AutoHashMap(i64, *CacheNode).init(allocator),
+            .head = null,
+            .tail = null,
+            .mutex = .{},
+        };
+        return cache;
+    }
+
+    /// Clean up the cache and free all resources
+    pub fn deinit(self: *ArtworkCache) void {
+        // Lock to ensure no concurrent access
+        self.mutex.lock();
+        // Note: We don't defer unlock because we're about to destroy self
+
+        // Free all nodes
+        var current = self.head;
+        while (current) |node| {
+            const next = node.next;
+            self.allocator.destroy(node);
+            current = next;
+        }
+
+        // Deinit map and capture allocator before destroying self
+        self.map.deinit();
+        const allocator = self.allocator;
+
+        // Unlock before destroying (mutex is part of self)
+        self.mutex.unlock();
+
+        // Now safe to destroy self
+        allocator.destroy(self);
+    }
+
+    /// Get artwork for a track, using cache if available
+    /// This method caches both Some and None results (important behavior)
+    pub fn getOrLoad(self: *ArtworkCache, track_id: i64, filepath: [*:0]const u8) ?Artwork {
+        // Phase 1: Check cache (with lock)
+        {
+            self.mutex.lock();
+            defer self.mutex.unlock();
+
+            if (self.map.get(track_id)) |node| {
+                // Cache hit - move to front (most recently used)
+                self.moveToFrontLocked(node);
+                return node.artwork;
+            }
+        }
+
+        // Phase 2: Load from file (without lock - allows concurrent I/O)
+        const artwork = extractArtwork(filepath);
+
+        // Phase 3: Store in cache (with lock)
+        {
+            self.mutex.lock();
+            defer self.mutex.unlock();
+
+            // Double-check if another thread loaded it while we were loading
+            if (self.map.get(track_id)) |node| {
+                self.moveToFrontLocked(node);
+                return node.artwork;
+            }
+
+            // Create new node
+            const node = self.allocator.create(CacheNode) catch return artwork;
+            node.* = .{
+                .track_id = track_id,
+                .artwork = artwork,
+                .prev = null,
+                .next = null,
+            };
+
+            // Insert at front
+            self.insertAtFrontLocked(node);
+
+            // Add to map
+            self.map.put(track_id, node) catch {
+                // Failed to add to map - remove from list and free
+                self.removeFromListLocked(node);
+                self.allocator.destroy(node);
+                return artwork;
+            };
+
+            // Evict LRU if over capacity
+            if (self.map.count() > self.capacity) {
+                self.evictLRULocked();
+            }
+        }
+
+        return artwork;
+    }
+
+    /// Invalidate cache entry for a specific track
+    pub fn invalidate(self: *ArtworkCache, track_id: i64) void {
+        self.mutex.lock();
+        defer self.mutex.unlock();
+
+        if (self.map.fetchRemove(track_id)) |kv| {
+            self.removeFromListLocked(kv.value);
+            self.allocator.destroy(kv.value);
+        }
+    }
+
+    /// Clear all cache entries
+    pub fn clear(self: *ArtworkCache) void {
+        self.mutex.lock();
+        defer self.mutex.unlock();
+
+        // Free all nodes
+        var current = self.head;
+        while (current) |node| {
+            const next = node.next;
+            self.allocator.destroy(node);
+            current = next;
+        }
+
+        self.map.clearAndFree();
+        self.head = null;
+        self.tail = null;
+    }
+
+    /// Get current number of cached items
+    pub fn len(self: *ArtworkCache) usize {
+        self.mutex.lock();
+        defer self.mutex.unlock();
+        return self.map.count();
+    }
+
+    /// Check if cache is empty
+    pub fn isEmpty(self: *ArtworkCache) bool {
+        return self.len() == 0;
+    }
+
+    // =========================================================================
+    // Private helper methods (must be called with mutex held)
+    // =========================================================================
+
+    /// Move node to front of linked list (mark as most recently used)
+    /// Caller must hold mutex
+    fn moveToFrontLocked(self: *ArtworkCache, node: *CacheNode) void {
+        if (self.head == node) {
+            return; // Already at front
+        }
+
+        // Remove from current position
+        self.removeFromListLocked(node);
+
+        // Insert at front
+        self.insertAtFrontLocked(node);
+    }
+
+    /// Insert node at front of linked list
+    /// Caller must hold mutex
+    fn insertAtFrontLocked(self: *ArtworkCache, node: *CacheNode) void {
+        node.prev = null;
+        node.next = self.head;
+
+        if (self.head) |head| {
+            head.prev = node;
+        }
+        self.head = node;
+
+        if (self.tail == null) {
+            self.tail = node;
+        }
+    }
+
+    /// Remove node from linked list (doesn't free the node)
+    /// Caller must hold mutex
+    fn removeFromListLocked(self: *ArtworkCache, node: *CacheNode) void {
+        if (node.prev) |prev| {
+            prev.next = node.next;
+        } else {
+            self.head = node.next;
+        }
+
+        if (node.next) |next| {
+            next.prev = node.prev;
+        } else {
+            self.tail = node.prev;
+        }
+
+        node.prev = null;
+        node.next = null;
+    }
+
+    /// Remove least recently used node (tail) when at capacity
+    /// Caller must hold mutex
+    fn evictLRULocked(self: *ArtworkCache) void {
+        if (self.tail) |tail| {
+            _ = self.map.remove(tail.track_id);
+            self.removeFromListLocked(tail);
+            self.allocator.destroy(tail);
+        }
+    }
+};
+
+// =============================================================================
+// Artwork extraction functions
+// =============================================================================
+
+/// Standard folder artwork filenames to search for
+const FOLDER_ARTWORK_NAMES = [_][]const u8{
+    "cover.jpg",
+    "cover.jpeg",
+    "cover.png",
+    "folder.jpg",
+    "folder.jpeg",
+    "folder.png",
+    "album.jpg",
+    "album.jpeg",
+    "album.png",
+    "front.jpg",
+    "front.jpeg",
+    "front.png",
+};
+
+/// Extract artwork from file (embedded or folder-based)
+fn extractArtwork(filepath: [*:0]const u8) ?Artwork {
+    // Try embedded artwork first
+    if (extractEmbeddedArtwork(filepath)) |artwork| {
+        return artwork;
+    }
+
+    // Fall back to folder-based artwork
+    return extractFolderArtwork(filepath);
+}
+
+/// Extract embedded artwork using TagLib C bindings
+/// NOTE: Currently returns null - embedded artwork extraction stays in Rust via lofty
+/// This is a placeholder for future TagLib C integration
+fn extractEmbeddedArtwork(filepath: [*:0]const u8) ?Artwork {
+    // NOTE: Per migration plan, metadata/artwork extraction stays in Rust via lofty.
+    // This function is a placeholder that returns null.
+    // When calling from Rust, use the FFI to call Rust's get_artwork instead.
+    _ = filepath;
+    return null;
+}
+
+/// Find folder-based artwork in same directory
+fn extractFolderArtwork(filepath: [*:0]const u8) ?Artwork {
+    const path_slice = std.mem.span(filepath);
+
+    // Get directory from filepath
+    const dir_path = std.fs.path.dirname(path_slice) orelse return null;
+
+    // Try each standard artwork filename
+    for (FOLDER_ARTWORK_NAMES) |artwork_name| {
+        var path_buf: [std.fs.max_path_bytes]u8 = undefined;
+        const full_path = std.fmt.bufPrint(&path_buf, "{s}/{s}", .{ dir_path, artwork_name }) catch continue;
+
+        // Try to read the file
+        const file = std.fs.openFileAbsolute(full_path, .{}) catch continue;
+        defer file.close();
+
+        // Read file contents (limit to reasonable size for artwork)
+        var data_buf: [8192]u8 = undefined;
+        const bytes_read = file.readAll(&data_buf) catch continue;
+
+        if (bytes_read == 0) continue;
+
+        // Determine mime type from extension
+        const mime_type = getMimeTypeFromFilename(artwork_name);
+
+        // Create artwork struct
+        return Artwork.init(
+            data_buf[0..bytes_read],
+            mime_type,
+            "folder",
+            artwork_name,
+        );
+    }
+
+    return null;
+}
+
+/// Get MIME type from filename extension
+fn getMimeTypeFromFilename(filename: []const u8) []const u8 {
+    if (std.mem.endsWith(u8, filename, ".jpg") or std.mem.endsWith(u8, filename, ".jpeg")) {
+        return "image/jpeg";
+    } else if (std.mem.endsWith(u8, filename, ".png")) {
+        return "image/png";
+    }
+    return "application/octet-stream";
+}
+
+// =============================================================================
+// Tests
+// =============================================================================
+
+test "ArtworkCache creation" {
+    const allocator = std.testing.allocator;
+
+    const cache = try ArtworkCache.init(allocator, DEFAULT_CACHE_SIZE);
+    defer cache.deinit();
+
+    try std.testing.expectEqual(@as(usize, 0), cache.len());
+    try std.testing.expect(cache.isEmpty());
+}
+
+test "ArtworkCache custom capacity" {
+    const allocator = std.testing.allocator;
+
+    const cache = try ArtworkCache.init(allocator, 50);
+    defer cache.deinit();
+
+    try std.testing.expectEqual(@as(usize, 50), cache.capacity);
+    try std.testing.expectEqual(@as(usize, 0), cache.len());
+}
+
+test "ArtworkCache caches None results" {
+    const allocator = std.testing.allocator;
+
+    const cache = try ArtworkCache.init(allocator, DEFAULT_CACHE_SIZE);
+    defer cache.deinit();
+
+    // Load artwork for a non-existent file (will return null)
+    const artwork1 = cache.getOrLoad(1, "/nonexistent/path/song.mp3");
+    try std.testing.expect(artwork1 == null);
+
+    // Should have cached the None result
+    try std.testing.expectEqual(@as(usize, 1), cache.len());
+
+    // Second call should return cached null
+    const artwork2 = cache.getOrLoad(1, "/nonexistent/path/song.mp3");
+    try std.testing.expect(artwork2 == null);
+    try std.testing.expectEqual(@as(usize, 1), cache.len());
+}
+
+test "ArtworkCache LRU eviction" {
+    const allocator = std.testing.allocator;
+
+    // Create cache with capacity 3
+    const cache = try ArtworkCache.init(allocator, 3);
+    defer cache.deinit();
+
+    // Add 4 items
+    _ = cache.getOrLoad(1, "/path/song1.mp3");
+    _ = cache.getOrLoad(2, "/path/song2.mp3");
+    _ = cache.getOrLoad(3, "/path/song3.mp3");
+    _ = cache.getOrLoad(4, "/path/song4.mp3");
+
+    // Cache should only hold 3 items (LRU evicted the oldest - track 1)
+    try std.testing.expectEqual(@as(usize, 3), cache.len());
+}
+
+test "ArtworkCache invalidation" {
+    const allocator = std.testing.allocator;
+
+    const cache = try ArtworkCache.init(allocator, DEFAULT_CACHE_SIZE);
+    defer cache.deinit();
+
+    _ = cache.getOrLoad(1, "/path/song.mp3");
+    try std.testing.expectEqual(@as(usize, 1), cache.len());
+
+    cache.invalidate(1);
+    try std.testing.expectEqual(@as(usize, 0), cache.len());
+}
+
+test "ArtworkCache clear" {
+    const allocator = std.testing.allocator;
+
+    const cache = try ArtworkCache.init(allocator, DEFAULT_CACHE_SIZE);
+    defer cache.deinit();
+
+    // Add several items
+    _ = cache.getOrLoad(1, "/path/song1.mp3");
+    _ = cache.getOrLoad(2, "/path/song2.mp3");
+    _ = cache.getOrLoad(3, "/path/song3.mp3");
+    try std.testing.expectEqual(@as(usize, 3), cache.len());
+
+    cache.clear();
+    try std.testing.expectEqual(@as(usize, 0), cache.len());
+    try std.testing.expect(cache.isEmpty());
+}
+
+test "ArtworkCache LRU ordering" {
+    const allocator = std.testing.allocator;
+
+    // Create cache with capacity 3
+    const cache = try ArtworkCache.init(allocator, 3);
+    defer cache.deinit();
+
+    // Add 3 items
+    _ = cache.getOrLoad(1, "/path/song1.mp3");
+    _ = cache.getOrLoad(2, "/path/song2.mp3");
+    _ = cache.getOrLoad(3, "/path/song3.mp3");
+
+    // Access item 1 again (moves it to front)
+    _ = cache.getOrLoad(1, "/path/song1.mp3");
+
+    // Add item 4 - should evict item 2 (oldest after 1 was accessed)
+    _ = cache.getOrLoad(4, "/path/song4.mp3");
+
+    try std.testing.expectEqual(@as(usize, 3), cache.len());
+}
+
+test "Artwork struct creation" {
+    const artwork = Artwork.init(
+        "test_data",
+        "image/jpeg",
+        "folder",
+        "cover.jpg",
+    );
+
+    try std.testing.expect(artwork != null);
+
+    const art = artwork.?;
+    try std.testing.expectEqualStrings("test_data", art.getData());
+    try std.testing.expectEqualStrings("image/jpeg", art.getMimeType());
+    try std.testing.expectEqualStrings("folder", art.getSource());
+    try std.testing.expectEqualStrings("cover.jpg", art.getFilename().?);
+}
+
+test "getMimeTypeFromFilename" {
+    try std.testing.expectEqualStrings("image/jpeg", getMimeTypeFromFilename("cover.jpg"));
+    try std.testing.expectEqualStrings("image/jpeg", getMimeTypeFromFilename("cover.jpeg"));
+    try std.testing.expectEqualStrings("image/png", getMimeTypeFromFilename("cover.png"));
+    try std.testing.expectEqualStrings("application/octet-stream", getMimeTypeFromFilename("cover.gif"));
+}
diff --git a/zig-core/src/scanner/fingerprint.zig b/zig-core/src/scanner/fingerprint.zig
new file mode 100644
index 0000000..7a1fad6
--- /dev/null
+++ b/zig-core/src/scanner/fingerprint.zig
@@ -0,0 +1,72 @@
+//! File fingerprinting for change detection.
+//!
+//! Uses file modification time (mtime_ns) and file size as a fingerprint
+//! to detect changes without reading file contents.
+
+const std = @import("std");
+const types = @import("../types.zig");
+const FileFingerprint = types.FileFingerprint;
+
+/// Get file fingerprint from path
+pub fn fromPath(path: []const u8) !FileFingerprint {
+    // Need null-terminated path for std.fs
+    var path_buf: [4096]u8 = undefined;
+    const path_z = std.fmt.bufPrintZ(&path_buf, "{s}", .{path}) catch {
+        return error.PathTooLong;
+    };
+
+    const file = std.fs.cwd().openFile(path_z, .{}) catch |err| {
+        return switch (err) {
+            error.FileNotFound => error.FileNotFound,
+            else => error.AccessDenied,
+        };
+    };
+    defer file.close();
+
+    const stat = try file.stat();
+
+    return FileFingerprint{
+        .mtime_ns = @intCast(stat.mtime),
+        .size = @intCast(stat.size),
+        .inode = stat.inode,
+        .has_mtime = true,
+        .has_inode = stat.inode != 0,
+    };
+}
+
+/// Create fingerprint from database values (no inode)
+pub fn fromDb(mtime_ns: ?i64, size: i64) FileFingerprint {
+    return FileFingerprint{
+        .mtime_ns = mtime_ns orelse 0,
+        .size = size,
+        .inode = 0,
+        .has_mtime = mtime_ns != null,
+        .has_inode = false,
+    };
+}
+
+/// Create fingerprint from database values with inode
+pub fn fromDbWithInode(mtime_ns: ?i64, size: i64, inode: ?u64) FileFingerprint {
+    return FileFingerprint{
+        .mtime_ns = mtime_ns orelse 0,
+        .size = size,
+        .inode = inode orelse 0,
+        .has_mtime = mtime_ns != null,
+        .has_inode = inode != null,
+    };
+}
+
+test "fromDb" {
+    const fp = fromDb(1234567890, 5000);
+    try std.testing.expectEqual(@as(i64, 1234567890), fp.mtime_ns);
+    try std.testing.expectEqual(@as(i64, 5000), fp.size);
+    try std.testing.expect(!fp.has_inode);
+}
+
+test "fromDbWithInode" {
+    const fp = fromDbWithInode(1234567890, 5000, 12345);
+    try std.testing.expectEqual(@as(i64, 1234567890), fp.mtime_ns);
+    try std.testing.expectEqual(@as(i64, 5000), fp.size);
+    try std.testing.expectEqual(@as(u64, 12345), fp.inode);
+    try std.testing.expect(fp.has_inode);
+}
diff --git a/zig-core/src/scanner/inventory.zig b/zig-core/src/scanner/inventory.zig
new file mode 100644
index 0000000..8217abb
--- /dev/null
+++ b/zig-core/src/scanner/inventory.zig
@@ -0,0 +1,535 @@
+//! Directory inventory scanning for music files.
+//!
+//! Phase 1 of the scan pipeline: walks the filesystem, collects file stats,
+//! and compares fingerprints with the database to classify files as
+//! added/modified/unchanged/deleted.
+
+const std = @import("std");
+const types = @import("../types.zig");
+const Allocator = std.mem.Allocator;
+
+/// Progress callback type
+pub const ProgressCallback = ?*const fn (visited: usize) callconv(.C) void;
+
+/// Entry representing a file and its fingerprint
+pub const FileEntry = struct {
+    filepath: []const u8,
+    fingerprint: types.FileFingerprint,
+};
+
+/// Result of the inventory phase
+pub const InventoryResult = struct {
+    /// New files not in database (filepath, fingerprint)
+    added: std.ArrayList(FileEntry),
+    /// Files with changed fingerprint (filepath, new_fingerprint)
+    modified: std.ArrayList(FileEntry),
+    /// Files with unchanged fingerprint
+    unchanged: std.ArrayList([]const u8),
+    /// Files in DB but not on filesystem
+    deleted: std.ArrayList([]const u8),
+    /// Statistics
+    stats: types.ScanStats,
+
+    allocator: Allocator,
+
+    pub fn init(allocator: Allocator) InventoryResult {
+        return .{
+            .added = std.ArrayList(FileEntry).init(allocator),
+            .modified = std.ArrayList(FileEntry).init(allocator),
+            .unchanged = std.ArrayList([]const u8).init(allocator),
+            .deleted = std.ArrayList([]const u8).init(allocator),
+            .stats = std.mem.zeroes(types.ScanStats),
+            .allocator = allocator,
+        };
+    }
+
+    pub fn deinit(self: *InventoryResult) void {
+        // Free duplicated filepath strings in added/modified
+        for (self.added.items) |entry| {
+            self.allocator.free(entry.filepath);
+        }
+        for (self.modified.items) |entry| {
+            self.allocator.free(entry.filepath);
+        }
+        for (self.unchanged.items) |filepath| {
+            self.allocator.free(filepath);
+        }
+        for (self.deleted.items) |filepath| {
+            self.allocator.free(filepath);
+        }
+
+        self.added.deinit();
+        self.modified.deinit();
+        self.unchanged.deinit();
+        self.deleted.deinit();
+    }
+};
+
+/// Scan results for legacy API
+pub const ScanResults = extern struct {
+    files_found: u64,
+    files_excluded: u64,
+    directories_scanned: u64,
+    errors: u64,
+};
+
+/// Database fingerprint entry for comparison
+pub const DbFingerprint = struct {
+    filepath: []const u8,
+    fingerprint: types.FileFingerprint,
+};
+
+/// Run inventory phase on given paths.
+///
+/// Walks the filesystem, collects fingerprints, and compares with database
+/// to determine which files need metadata extraction.
+pub fn runInventory(
+    allocator: Allocator,
+    paths: []const []const u8,
+    db_fingerprints: []const DbFingerprint,
+    recursive: bool,
+    progress_fn: ProgressCallback,
+) !InventoryResult {
+    var result = InventoryResult.init(allocator);
+    errdefer result.deinit();
+
+    // Build a map of database fingerprints for fast lookup
+    var db_map = std.StringHashMap(types.FileFingerprint).init(allocator);
+    defer db_map.deinit();
+
+    for (db_fingerprints) |entry| {
+        try db_map.put(entry.filepath, entry.fingerprint);
+    }
+
+    // Collect filesystem files
+    var filesystem_files = std.StringHashMap(types.FileFingerprint).init(allocator);
+    defer {
+        // Free the keys we allocated
+        var it = filesystem_files.iterator();
+        while (it.next()) |entry| {
+            allocator.free(entry.key_ptr.*);
+        }
+        filesystem_files.deinit();
+    }
+
+    // Walk each path
+    for (paths) |path| {
+        try walkPath(allocator, path, recursive, &filesystem_files, &result.stats, progress_fn);
+    }
+
+    // Classify files by comparing fingerprints
+    var fs_it = filesystem_files.iterator();
+    while (fs_it.next()) |entry| {
+        const filepath = entry.key_ptr.*;
+        const fs_fingerprint = entry.value_ptr.*;
+
+        if (db_map.get(filepath)) |db_fingerprint| {
+            if (fs_fingerprint.matches(db_fingerprint)) {
+                // File exists with same fingerprint - unchanged
+                const filepath_copy = try allocator.dupe(u8, filepath);
+                try result.unchanged.append(filepath_copy);
+                result.stats.unchanged += 1;
+            } else {
+                // File exists but fingerprint changed - modified
+                const filepath_copy = try allocator.dupe(u8, filepath);
+                try result.modified.append(.{
+                    .filepath = filepath_copy,
+                    .fingerprint = fs_fingerprint,
+                });
+                result.stats.modified += 1;
+            }
+        } else {
+            // New file - not in DB - added
+            const filepath_copy = try allocator.dupe(u8, filepath);
+            try result.added.append(.{
+                .filepath = filepath_copy,
+                .fingerprint = fs_fingerprint,
+            });
+            result.stats.added += 1;
+        }
+    }
+
+    // Find deleted files (in DB but not on filesystem)
+    for (db_fingerprints) |db_entry| {
+        if (!filesystem_files.contains(db_entry.filepath)) {
+            const filepath_copy = try allocator.dupe(u8, db_entry.filepath);
+            try result.deleted.append(filepath_copy);
+            result.stats.deleted += 1;
+        }
+    }
+
+    return result;
+}
+
+/// Walk a single path (file or directory)
+fn walkPath(
+    allocator: Allocator,
+    path: []const u8,
+    recursive: bool,
+    filesystem_files: *std.StringHashMap(types.FileFingerprint),
+    stats: *types.ScanStats,
+    progress_fn: ProgressCallback,
+) !void {
+    // Check if path exists
+    const stat_result = std.fs.cwd().statFile(path) catch |err| {
+        if (err == error.FileNotFound) {
+            return; // Path doesn't exist, skip
+        }
+        stats.errors += 1;
+        return;
+    };
+
+    if (stat_result.kind == .file) {
+        // Single file
+        if (types.isAudioFile(path)) {
+            const fingerprint = fingerprintFromStat(stat_result);
+            const filepath_copy = try allocator.dupe(u8, path);
+            try filesystem_files.put(filepath_copy, fingerprint);
+            stats.visited += 1;
+
+            if (progress_fn) |callback| {
+                callback(stats.visited);
+            }
+        }
+    } else if (stat_result.kind == .directory) {
+        // Directory - scan for audio files
+        try walkDirectory(allocator, path, recursive, filesystem_files, stats, progress_fn);
+    }
+}
+
+/// Walk a directory for audio files
+fn walkDirectory(
+    allocator: Allocator,
+    dir_path: []const u8,
+    recursive: bool,
+    filesystem_files: *std.StringHashMap(types.FileFingerprint),
+    stats: *types.ScanStats,
+    progress_fn: ProgressCallback,
+) !void {
+    var dir = std.fs.cwd().openDir(dir_path, .{ .iterate = true }) catch |err| {
+        if (err == error.AccessDenied or err == error.FileNotFound) {
+            return;
+        }
+        stats.errors += 1;
+        return;
+    };
+    defer dir.close();
+
+    var walker = dir.iterate();
+    while (walker.next() catch null) |entry| {
+        // Build full path
+        var path_buf: [std.fs.max_path_bytes]u8 = undefined;
+        const full_path = std.fmt.bufPrint(&path_buf, "{s}/{s}", .{ dir_path, entry.name }) catch continue;
+
+        if (entry.kind == .file) {
+            if (types.isAudioFile(full_path)) {
+                // Get file stat for fingerprint
+                const stat_result = std.fs.cwd().statFile(full_path) catch {
+                    stats.errors += 1;
+                    continue;
+                };
+
+                const fingerprint = fingerprintFromStat(stat_result);
+                const filepath_copy = try allocator.dupe(u8, full_path);
+                try filesystem_files.put(filepath_copy, fingerprint);
+                stats.visited += 1;
+
+                if (progress_fn) |callback| {
+                    callback(stats.visited);
+                }
+            }
+        } else if (entry.kind == .directory and recursive) {
+            // Recurse into subdirectory
+            try walkDirectory(allocator, full_path, recursive, filesystem_files, stats, progress_fn);
+        } else if (entry.kind == .sym_link) {
+            // Follow symlinks (like Rust's follow_links(true))
+            const link_stat = std.fs.cwd().statFile(full_path) catch continue;
+            if (link_stat.kind == .file and types.isAudioFile(full_path)) {
+                const fingerprint = fingerprintFromStat(link_stat);
+                const filepath_copy = try allocator.dupe(u8, full_path);
+                try filesystem_files.put(filepath_copy, fingerprint);
+                stats.visited += 1;
+
+                if (progress_fn) |callback| {
+                    callback(stats.visited);
+                }
+            } else if (link_stat.kind == .directory and recursive) {
+                try walkDirectory(allocator, full_path, recursive, filesystem_files, stats, progress_fn);
+            }
+        }
+    }
+}
+
+/// Create a FileFingerprint from stat result
+fn fingerprintFromStat(stat: std.fs.File.Stat) types.FileFingerprint {
+    // stat.mtime is i128, but we use i64 for FFI compatibility
+    // Current timestamps fit in i64 (max ~292 years from 1970)
+    const mtime: i64 = @intCast(stat.mtime);
+    return .{
+        .mtime_ns = mtime,
+        .size = @intCast(stat.size),
+        .inode = stat.inode,
+        .has_mtime = true,
+        .has_inode = stat.inode != 0,
+    };
+}
+
+/// Create a FileFingerprint from database values
+pub fn fingerprintFromDb(mtime_ns: ?i64, size: i64) types.FileFingerprint {
+    return .{
+        .mtime_ns = mtime_ns orelse 0,
+        .size = size,
+        .inode = 0,
+        .has_mtime = mtime_ns != null,
+        .has_inode = false,
+    };
+}
+
+// =============================================================================
+// Legacy API for compatibility with skeleton
+// =============================================================================
+
+/// Inventory scanner (legacy API)
+pub const InventoryScanner = struct {
+    allocator: Allocator,
+    result: ?InventoryResult,
+    recursive: bool,
+
+    pub fn init(allocator: Allocator) !*InventoryScanner {
+        const scanner = try allocator.create(InventoryScanner);
+        scanner.* = .{
+            .allocator = allocator,
+            .result = null,
+            .recursive = true,
+        };
+        return scanner;
+    }
+
+    pub fn deinit(self: *InventoryScanner) void {
+        if (self.result) |*result| {
+            result.deinit();
+        }
+        self.allocator.destroy(self);
+    }
+
+    pub fn scanDirectory(
+        self: *InventoryScanner,
+        path: [*:0]const u8,
+        results: *ScanResults,
+    ) !void {
+        const path_slice = std.mem.span(path);
+
+        // Clear previous result
+        if (self.result) |*result| {
+            result.deinit();
+        }
+
+        // Run inventory with empty DB (all files are "new")
+        const empty_db: []const DbFingerprint = &.{};
+        self.result = try runInventory(
+            self.allocator,
+            &.{path_slice},
+            empty_db,
+            self.recursive,
+            null,
+        );
+
+        // Populate legacy results
+        results.files_found = self.result.?.stats.visited;
+        results.files_excluded = 0;
+        results.directories_scanned = 0; // Not tracked in new API
+        results.errors = self.result.?.stats.errors;
+    }
+
+    pub fn getFiles(self: *InventoryScanner) []const FileEntry {
+        if (self.result) |*result| {
+            return result.added.items;
+        }
+        return &.{};
+    }
+
+    pub fn setRecursive(self: *InventoryScanner, recursive: bool) void {
+        self.recursive = recursive;
+    }
+};
+
+// =============================================================================
+// Tests
+// =============================================================================
+
+test "InventoryScanner creation" {
+    const allocator = std.testing.allocator;
+
+    const scanner = try InventoryScanner.init(allocator);
+    defer scanner.deinit();
+
+    try std.testing.expect(scanner.result == null);
+}
+
+test "runInventory empty directory" {
+    const allocator = std.testing.allocator;
+
+    // Create a temporary directory
+    var tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    const path = try tmp_dir.dir.realpathAlloc(allocator, ".");
+    defer allocator.free(path);
+
+    const empty_db: []const DbFingerprint = &.{};
+    var result = try runInventory(allocator, &.{path}, empty_db, true, null);
+    defer result.deinit();
+
+    try std.testing.expectEqual(@as(u64, 0), result.stats.visited);
+    try std.testing.expectEqual(@as(u64, 0), result.stats.added);
+    try std.testing.expectEqual(@as(usize, 0), result.added.items.len);
+}
+
+test "runInventory finds audio files" {
+    const allocator = std.testing.allocator;
+
+    // Create a temporary directory
+    var tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    // Create test audio files
+    try tmp_dir.dir.writeFile(.{ .sub_path = "song1.mp3", .data = "fake mp3" });
+    try tmp_dir.dir.writeFile(.{ .sub_path = "song2.flac", .data = "fake flac" });
+    try tmp_dir.dir.writeFile(.{ .sub_path = "image.jpg", .data = "fake image" }); // Should be ignored
+
+    const path = try tmp_dir.dir.realpathAlloc(allocator, ".");
+    defer allocator.free(path);
+
+    const empty_db: []const DbFingerprint = &.{};
+    var result = try runInventory(allocator, &.{path}, empty_db, true, null);
+    defer result.deinit();
+
+    try std.testing.expectEqual(@as(u64, 2), result.stats.visited); // Only audio files
+    try std.testing.expectEqual(@as(u64, 2), result.stats.added);
+    try std.testing.expectEqual(@as(usize, 2), result.added.items.len);
+}
+
+test "runInventory detects unchanged files" {
+    const allocator = std.testing.allocator;
+
+    var tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    // Create test audio file
+    try tmp_dir.dir.writeFile(.{ .sub_path = "song.mp3", .data = "fake mp3" });
+
+    const path = try tmp_dir.dir.realpathAlloc(allocator, ".");
+    defer allocator.free(path);
+
+    var filepath_buf: [std.fs.max_path_bytes]u8 = undefined;
+    const filepath = try std.fmt.bufPrint(&filepath_buf, "{s}/song.mp3", .{path});
+
+    // Get the actual fingerprint of the file
+    const stat = try std.fs.cwd().statFile(filepath);
+    const actual_fp = fingerprintFromStat(stat);
+
+    // Create DB fingerprint matching the actual file
+    const db_fingerprints = [_]DbFingerprint{
+        .{
+            .filepath = filepath,
+            .fingerprint = actual_fp,
+        },
+    };
+
+    var result = try runInventory(allocator, &.{path}, &db_fingerprints, true, null);
+    defer result.deinit();
+
+    try std.testing.expectEqual(@as(u64, 1), result.stats.visited);
+    try std.testing.expectEqual(@as(u64, 1), result.stats.unchanged);
+    try std.testing.expectEqual(@as(usize, 1), result.unchanged.items.len);
+    try std.testing.expectEqual(@as(usize, 0), result.added.items.len);
+    try std.testing.expectEqual(@as(usize, 0), result.modified.items.len);
+}
+
+test "runInventory detects deleted files" {
+    const allocator = std.testing.allocator;
+
+    var tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    const path = try tmp_dir.dir.realpathAlloc(allocator, ".");
+    defer allocator.free(path);
+
+    // DB has a file that doesn't exist on filesystem
+    const db_fingerprints = [_]DbFingerprint{
+        .{
+            .filepath = "/nonexistent/song.mp3",
+            .fingerprint = fingerprintFromDb(1234567890, 1000),
+        },
+    };
+
+    var result = try runInventory(allocator, &.{path}, &db_fingerprints, true, null);
+    defer result.deinit();
+
+    try std.testing.expectEqual(@as(u64, 1), result.stats.deleted);
+    try std.testing.expectEqual(@as(usize, 1), result.deleted.items.len);
+}
+
+test "runInventory detects modified files" {
+    const allocator = std.testing.allocator;
+
+    var tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    // Create test audio file
+    try tmp_dir.dir.writeFile(.{ .sub_path = "song.mp3", .data = "fake mp3" });
+
+    const path = try tmp_dir.dir.realpathAlloc(allocator, ".");
+    defer allocator.free(path);
+
+    var filepath_buf: [std.fs.max_path_bytes]u8 = undefined;
+    const filepath = try std.fmt.bufPrint(&filepath_buf, "{s}/song.mp3", .{path});
+
+    // DB has different fingerprint (different size)
+    const db_fingerprints = [_]DbFingerprint{
+        .{
+            .filepath = filepath,
+            .fingerprint = fingerprintFromDb(null, 9999), // Wrong size
+        },
+    };
+
+    var result = try runInventory(allocator, &.{path}, &db_fingerprints, true, null);
+    defer result.deinit();
+
+    try std.testing.expectEqual(@as(u64, 1), result.stats.visited);
+    try std.testing.expectEqual(@as(u64, 1), result.stats.modified);
+    try std.testing.expectEqual(@as(usize, 1), result.modified.items.len);
+}
+
+test "runInventory non-recursive mode" {
+    const allocator = std.testing.allocator;
+
+    var tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    // Create files in root and subdirectory
+    try tmp_dir.dir.writeFile(.{ .sub_path = "song1.mp3", .data = "fake mp3" });
+    try tmp_dir.dir.makeDir("subdir");
+    try tmp_dir.dir.writeFile(.{ .sub_path = "subdir/song2.mp3", .data = "fake mp3" });
+
+    const path = try tmp_dir.dir.realpathAlloc(allocator, ".");
+    defer allocator.free(path);
+
+    const empty_db: []const DbFingerprint = &.{};
+
+    // Non-recursive should only find song1.mp3
+    var result = try runInventory(allocator, &.{path}, empty_db, false, null);
+    defer result.deinit();
+
+    try std.testing.expectEqual(@as(u64, 1), result.stats.visited);
+    try std.testing.expectEqual(@as(u64, 1), result.stats.added);
+}
+
+test "fingerprintFromDb" {
+    const fp = fingerprintFromDb(1234567890, 1000);
+
+    try std.testing.expectEqual(@as(i64, 1234567890), fp.mtime_ns);
+    try std.testing.expectEqual(@as(i64, 1000), fp.size);
+    try std.testing.expect(fp.has_mtime);
+    try std.testing.expect(!fp.has_inode);
+}
diff --git a/zig-core/src/scanner/metadata.zig b/zig-core/src/scanner/metadata.zig
new file mode 100644
index 0000000..1ae9e4f
--- /dev/null
+++ b/zig-core/src/scanner/metadata.zig
@@ -0,0 +1,274 @@
+//! Metadata extraction using TagLib.
+//!
+//! Extracts audio metadata from files using the TagLib C bindings.
+
+const std = @import("std");
+const types = @import("../types.zig");
+const fingerprint = @import("fingerprint.zig");
+const ExtractedMetadata = types.ExtractedMetadata;
+const FileFingerprint = types.FileFingerprint;
+const ScanError = types.ScanError;
+
+// TagLib C API bindings
+const c = @cImport({
+    @cInclude("taglib/tag_c.h");
+});
+
+/// Extract metadata from a single audio file
+pub fn extractMetadata(filepath: []const u8) ExtractedMetadata {
+    var metadata = ExtractedMetadata.init();
+    metadata.setFilepath(filepath);
+
+    // Get file fingerprint
+    const fp = fingerprint.fromPath(filepath) catch |err| {
+        metadata.error_code = switch (err) {
+            error.FileNotFound => @intFromEnum(ScanError.path_not_found),
+            else => @intFromEnum(ScanError.io_error),
+        };
+        setTitleFromFilename(&metadata, filepath);
+        return metadata;
+    };
+
+    metadata.file_size = fp.size;
+    metadata.file_mtime_ns = fp.mtime_ns;
+    metadata.file_inode = fp.inode;
+    metadata.has_mtime = fp.has_mtime;
+    metadata.has_inode = fp.has_inode;
+
+    // Need null-terminated path for TagLib
+    var path_buf: [4096]u8 = undefined;
+    const path_z = std.fmt.bufPrintZ(&path_buf, "{s}", .{filepath}) catch {
+        metadata.error_code = @intFromEnum(ScanError.io_error);
+        setTitleFromFilename(&metadata, filepath);
+        return metadata;
+    };
+
+    // Open file with TagLib
+    const file = c.taglib_file_new(path_z.ptr);
+    if (file == null) {
+        metadata.error_code = @intFromEnum(ScanError.taglib_error);
+        setTitleFromFilename(&metadata, filepath);
+        return metadata;
+    }
+    defer c.taglib_file_free(file);
+
+    if (c.taglib_file_is_valid(file) == 0) {
+        metadata.error_code = @intFromEnum(ScanError.unsupported_format);
+        setTitleFromFilename(&metadata, filepath);
+        return metadata;
+    }
+
+    // Get audio properties
+    const properties = c.taglib_file_audioproperties(file);
+    if (properties != null) {
+        const length = c.taglib_audioproperties_length(properties);
+        if (length > 0) {
+            metadata.duration_secs = @floatFromInt(length);
+            metadata.has_duration = true;
+        }
+
+        const bitrate = c.taglib_audioproperties_bitrate(properties);
+        if (bitrate > 0) {
+            metadata.bitrate = @intCast(bitrate);
+            metadata.has_bitrate = true;
+        }
+
+        const sample_rate = c.taglib_audioproperties_samplerate(properties);
+        if (sample_rate > 0) {
+            metadata.sample_rate = @intCast(sample_rate);
+            metadata.has_sample_rate = true;
+        }
+
+        const channels = c.taglib_audioproperties_channels(properties);
+        if (channels > 0) {
+            metadata.channels = @intCast(channels);
+            metadata.has_channels = true;
+        }
+    }
+
+    // Get tags
+    const tag = c.taglib_file_tag(file);
+    if (tag != null) {
+        extractTag(&metadata, tag);
+    }
+
+    // Fallback: use filename as title if none found
+    if (metadata.title_len == 0) {
+        setTitleFromFilename(&metadata, filepath);
+    }
+
+    metadata.is_valid = true;
+    return metadata;
+}
+
+/// Helper to extract tag strings from TagLib
+fn extractTag(metadata: *ExtractedMetadata, tag: *c.TagLib_Tag) void {
+    // Title
+    const title = c.taglib_tag_title(tag);
+    if (title != null) {
+        const title_slice = std.mem.span(title);
+        if (title_slice.len > 0) {
+            metadata.setTitle(title_slice);
+        }
+        c.taglib_free(title);
+    }
+
+    // Artist
+    const artist = c.taglib_tag_artist(tag);
+    if (artist != null) {
+        const artist_slice = std.mem.span(artist);
+        if (artist_slice.len > 0) {
+            metadata.setArtist(artist_slice);
+        }
+        c.taglib_free(artist);
+    }
+
+    // Album
+    const album = c.taglib_tag_album(tag);
+    if (album != null) {
+        const album_slice = std.mem.span(album);
+        if (album_slice.len > 0) {
+            metadata.setAlbum(album_slice);
+        }
+        c.taglib_free(album);
+    }
+
+    // Genre
+    const genre = c.taglib_tag_genre(tag);
+    if (genre != null) {
+        const genre_slice = std.mem.span(genre);
+        if (genre_slice.len > 0) {
+            metadata.setGenre(genre_slice);
+        }
+        c.taglib_free(genre);
+    }
+
+    // Year -> date
+    const year = c.taglib_tag_year(tag);
+    if (year > 0) {
+        var year_buf: [32]u8 = undefined;
+        const year_str = std.fmt.bufPrint(&year_buf, "{d}", .{year}) catch "";
+        if (year_str.len > 0) {
+            metadata.setDate(year_str);
+        }
+    }
+
+    // Track number
+    const track = c.taglib_tag_track(tag);
+    if (track > 0) {
+        var track_buf: [32]u8 = undefined;
+        const track_str = std.fmt.bufPrint(&track_buf, "{d}", .{track}) catch "";
+        if (track_str.len > 0) {
+            metadata.setTrackNumber(track_str);
+        }
+    }
+}
+
+/// Extract filename (without extension) as fallback title
+fn setTitleFromFilename(metadata: *ExtractedMetadata, filepath: []const u8) void {
+    // Find last path separator
+    const name_start = if (std.mem.lastIndexOfScalar(u8, filepath, '/')) |idx|
+        idx + 1
+    else if (std.mem.lastIndexOfScalar(u8, filepath, '\\')) |idx|
+        idx + 1
+    else
+        0;
+
+    const filename = filepath[name_start..];
+
+    // Remove extension
+    const name_end = std.mem.lastIndexOfScalar(u8, filename, '.') orelse filename.len;
+    const stem = filename[0..name_end];
+
+    if (stem.len > 0) {
+        metadata.setTitle(stem);
+    } else {
+        metadata.setTitle("Unknown");
+    }
+}
+
+/// Thread pool for parallel extraction
+const ThreadPool = struct {
+    threads: []std.Thread,
+    allocator: std.mem.Allocator,
+
+    pub fn init(allocator: std.mem.Allocator, thread_count: usize) !ThreadPool {
+        const threads = try allocator.alloc(std.Thread, thread_count);
+        return ThreadPool{
+            .threads = threads,
+            .allocator = allocator,
+        };
+    }
+
+    pub fn deinit(self: *ThreadPool) void {
+        self.allocator.free(self.threads);
+    }
+};
+
+/// Batch extraction with parallelism
+pub fn extractMetadataBatch(
+    allocator: std.mem.Allocator,
+    filepaths: []const []const u8,
+) ![]ExtractedMetadata {
+    const results = try allocator.alloc(ExtractedMetadata, filepaths.len);
+
+    // For small batches, process serially
+    if (filepaths.len < 20) {
+        for (filepaths, 0..) |path, i| {
+            results[i] = extractMetadata(path);
+        }
+        return results;
+    }
+
+    // For larger batches, use thread pool
+    const thread_count = @min(std.Thread.getCpuCount() catch 4, filepaths.len);
+    const chunk_size = (filepaths.len + thread_count - 1) / thread_count;
+
+    var threads: [32]std.Thread = undefined;
+    var active_threads: usize = 0;
+
+    var i: usize = 0;
+    while (i < filepaths.len) : (i += chunk_size) {
+        const end = @min(i + chunk_size, filepaths.len);
+        const chunk_paths = filepaths[i..end];
+        const chunk_results = results[i..end];
+
+        threads[active_threads] = try std.Thread.spawn(.{}, processChunk, .{
+            chunk_paths,
+            chunk_results,
+        });
+        active_threads += 1;
+    }
+
+    // Wait for all threads
+    for (threads[0..active_threads]) |thread| {
+        thread.join();
+    }
+
+    return results;
+}
+
+fn processChunk(paths: []const []const u8, results: []ExtractedMetadata) void {
+    for (paths, 0..) |path, i| {
+        results[i] = extractMetadata(path);
+    }
+}
+
+test "extractMetadata nonexistent file" {
+    const metadata = extractMetadata("/nonexistent/file.mp3");
+    try std.testing.expect(!metadata.is_valid);
+    try std.testing.expect(metadata.error_code != 0);
+}
+
+test "setTitleFromFilename" {
+    var m = ExtractedMetadata.init();
+
+    setTitleFromFilename(&m, "/path/to/song.mp3");
+    try std.testing.expectEqualStrings("song", m.getTitle());
+
+    setTitleFromFilename(&m, "track.flac");
+    try std.testing.expectEqualStrings("track", m.getTitle());
+
+    setTitleFromFilename(&m, "/path/to/noext");
+    try std.testing.expectEqualStrings("noext", m.getTitle());
+}
diff --git a/zig-core/src/scanner/orchestration.zig b/zig-core/src/scanner/orchestration.zig
new file mode 100644
index 0000000..6c0303f
--- /dev/null
+++ b/zig-core/src/scanner/orchestration.zig
@@ -0,0 +1,491 @@
+//! Scan orchestration - coordinates inventory and progress reporting.
+//!
+//! Manages the scan pipeline from directory discovery through file categorization.
+//! Metadata extraction remains in Rust (via lofty), so this module focuses on
+//! inventory and progress coordination.
+
+const std = @import("std");
+const types = @import("../types.zig");
+const inventory = @import("inventory.zig");
+const Allocator = std.mem.Allocator;
+
+// =============================================================================
+// Scan Progress Types
+// =============================================================================
+
+/// Scan phase identifiers
+pub const ScanPhase = enum(u8) {
+    inventory = 0,
+    parse = 1,
+    complete = 2,
+
+    pub fn toString(self: ScanPhase) []const u8 {
+        return switch (self) {
+            .inventory => "inventory",
+            .parse => "parse",
+            .complete => "complete",
+        };
+    }
+};
+
+/// Scan progress event (FFI-safe)
+pub const ScanProgress = extern struct {
+    phase: u8,
+    current: u64,
+    total: u64,
+    filepath: [4096]u8,
+    filepath_len: u32,
+    message: [256]u8,
+    message_len: u32,
+
+    pub fn init(phase: ScanPhase, current: u64, total: u64) ScanProgress {
+        var progress = ScanProgress{
+            .phase = @intFromEnum(phase),
+            .current = current,
+            .total = total,
+            .filepath = undefined,
+            .filepath_len = 0,
+            .message = undefined,
+            .message_len = 0,
+        };
+        @memset(&progress.filepath, 0);
+        @memset(&progress.message, 0);
+        return progress;
+    }
+
+    pub fn withFilepath(self: *ScanProgress, path: []const u8) void {
+        const len = @min(path.len, self.filepath.len);
+        @memcpy(self.filepath[0..len], path[0..len]);
+        self.filepath_len = @intCast(len);
+    }
+
+    pub fn withMessage(self: *ScanProgress, msg: []const u8) void {
+        const len = @min(msg.len, self.message.len);
+        @memcpy(self.message[0..len], msg[0..len]);
+        self.message_len = @intCast(len);
+    }
+
+    pub fn getPhase(self: *const ScanProgress) ScanPhase {
+        return @enumFromInt(self.phase);
+    }
+
+    pub fn getFilepath(self: *const ScanProgress) []const u8 {
+        return self.filepath[0..self.filepath_len];
+    }
+
+    pub fn getMessage(self: *const ScanProgress) []const u8 {
+        return self.message[0..self.message_len];
+    }
+};
+
+/// Progress callback function type (C ABI)
+pub const ProgressCallback = *const fn (progress: *const ScanProgress) callconv(.C) void;
+
+// =============================================================================
+// Scan Statistics
+// =============================================================================
+
+/// Scan statistics
+pub const ScanStats = extern struct {
+    visited: u64,
+    added: u64,
+    modified: u64,
+    unchanged: u64,
+    deleted: u64,
+    errors: u64,
+
+    pub fn init() ScanStats {
+        return .{
+            .visited = 0,
+            .added = 0,
+            .modified = 0,
+            .unchanged = 0,
+            .deleted = 0,
+            .errors = 0,
+        };
+    }
+};
+
+// =============================================================================
+// Scan Result
+// =============================================================================
+
+/// Result of a 2-phase scan
+/// Contains categorized file paths and fingerprints for further processing
+pub const ScanResult2Phase = struct {
+    /// Files newly added (path + fingerprint)
+    added: std.ArrayList(FileWithFingerprint),
+    /// Files that were modified (path + fingerprint)
+    modified: std.ArrayList(FileWithFingerprint),
+    /// Paths of unchanged files
+    unchanged: std.ArrayList([]const u8),
+    /// Paths of deleted files
+    deleted: std.ArrayList([]const u8),
+    /// Scan statistics
+    stats: ScanStats,
+    /// Allocator for cleanup
+    allocator: Allocator,
+
+    pub fn init(allocator: Allocator) ScanResult2Phase {
+        return .{
+            .added = std.ArrayList(FileWithFingerprint).init(allocator),
+            .modified = std.ArrayList(FileWithFingerprint).init(allocator),
+            .unchanged = std.ArrayList([]const u8).init(allocator),
+            .deleted = std.ArrayList([]const u8).init(allocator),
+            .stats = ScanStats.init(),
+            .allocator = allocator,
+        };
+    }
+
+    pub fn deinit(self: *ScanResult2Phase) void {
+        // Free duplicated strings in added
+        for (self.added.items) |item| {
+            self.allocator.free(item.filepath);
+        }
+        self.added.deinit();
+
+        // Free duplicated strings in modified
+        for (self.modified.items) |item| {
+            self.allocator.free(item.filepath);
+        }
+        self.modified.deinit();
+
+        // Free duplicated strings in unchanged
+        for (self.unchanged.items) |path| {
+            self.allocator.free(path);
+        }
+        self.unchanged.deinit();
+
+        // Free duplicated strings in deleted
+        for (self.deleted.items) |path| {
+            self.allocator.free(path);
+        }
+        self.deleted.deinit();
+    }
+};
+
+/// File path with its fingerprint
+pub const FileWithFingerprint = struct {
+    filepath: []const u8, // Owned, must be freed
+    fingerprint: types.FileFingerprint,
+};
+
+// =============================================================================
+// Scan Orchestrator
+// =============================================================================
+
+/// Scan orchestrator - coordinates the scan pipeline
+pub const ScanOrchestrator = struct {
+    allocator: Allocator,
+    progress_callback: ?ProgressCallback,
+
+    /// Initialize a new scan orchestrator
+    pub fn init(allocator: Allocator) !*ScanOrchestrator {
+        const orchestrator = try allocator.create(ScanOrchestrator);
+        orchestrator.* = .{
+            .allocator = allocator,
+            .progress_callback = null,
+        };
+        return orchestrator;
+    }
+
+    /// Clean up the orchestrator
+    pub fn deinit(self: *ScanOrchestrator) void {
+        self.allocator.destroy(self);
+    }
+
+    /// Set the progress callback for scan events
+    pub fn setProgressCallback(self: *ScanOrchestrator, callback: ?ProgressCallback) void {
+        self.progress_callback = callback;
+    }
+
+    /// Emit a progress event
+    fn emitProgress(self: *ScanOrchestrator, progress: *const ScanProgress) void {
+        if (self.progress_callback) |callback| {
+            callback(progress);
+        }
+    }
+
+    /// Run inventory-only scan (no metadata extraction)
+    /// Returns categorized file lists for Rust to process
+    pub fn scanInventory(
+        self: *ScanOrchestrator,
+        paths: []const []const u8,
+        db_fingerprints: []const inventory.DbFingerprint,
+        recursive: bool,
+    ) !ScanResult2Phase {
+        var result = ScanResult2Phase.init(self.allocator);
+        errdefer result.deinit();
+
+        // Emit inventory start progress
+        var start_progress = ScanProgress.init(.inventory, 0, 0);
+        start_progress.withMessage("Starting inventory phase...");
+        self.emitProgress(&start_progress);
+
+        // Run inventory (inventory uses a simple visited count callback)
+        // We emit progress for start/complete; inventory handles per-file
+        const inv_result = try inventory.runInventory(
+            self.allocator,
+            paths,
+            db_fingerprints,
+            recursive,
+            null, // No per-file progress for now (FFI layer can add if needed)
+        );
+        defer @constCast(&inv_result).deinit();
+
+        // Convert inventory result to scan result
+        // Copy added files
+        for (inv_result.added.items) |item| {
+            const path_copy = try self.allocator.dupe(u8, item.filepath);
+            try result.added.append(.{
+                .filepath = path_copy,
+                .fingerprint = item.fingerprint,
+            });
+        }
+
+        // Copy modified files
+        for (inv_result.modified.items) |item| {
+            const path_copy = try self.allocator.dupe(u8, item.filepath);
+            try result.modified.append(.{
+                .filepath = path_copy,
+                .fingerprint = item.fingerprint,
+            });
+        }
+
+        // Copy unchanged paths
+        for (inv_result.unchanged.items) |path| {
+            const path_copy = try self.allocator.dupe(u8, path);
+            try result.unchanged.append(path_copy);
+        }
+
+        // Copy deleted paths
+        for (inv_result.deleted.items) |path| {
+            const path_copy = try self.allocator.dupe(u8, path);
+            try result.deleted.append(path_copy);
+        }
+
+        // Update stats
+        result.stats = .{
+            .visited = inv_result.stats.visited,
+            .added = inv_result.stats.added,
+            .modified = inv_result.stats.modified,
+            .unchanged = inv_result.stats.unchanged,
+            .deleted = inv_result.stats.deleted,
+            .errors = 0,
+        };
+
+        // Emit complete progress
+        var complete_progress = ScanProgress.init(.complete, result.stats.visited, result.stats.visited);
+        self.emitProgress(&complete_progress);
+
+        return result;
+    }
+
+    /// Run a full 2-phase scan
+    /// Phase 1: Inventory (Zig)
+    /// Phase 2: Returns files for Rust to extract metadata
+    ///
+    /// Note: Metadata extraction stays in Rust via lofty, so this returns
+    /// the file lists for Rust to process.
+    pub fn scan2Phase(
+        self: *ScanOrchestrator,
+        paths: []const []const u8,
+        db_fingerprints: []const inventory.DbFingerprint,
+        recursive: bool,
+    ) !ScanResult2Phase {
+        // Phase 1: Inventory
+        const result = try self.scanInventory(paths, db_fingerprints, recursive);
+
+        // Emit parse phase start (Rust will handle actual parsing)
+        const total_to_parse = result.added.items.len + result.modified.items.len;
+        var parse_progress = ScanProgress.init(.parse, 0, @intCast(total_to_parse));
+        parse_progress.withMessage("Ready for metadata extraction...");
+        self.emitProgress(&parse_progress);
+
+        // Return result - Rust will call metadata extraction separately
+        return result;
+    }
+};
+
+// =============================================================================
+// Standalone Functions
+// =============================================================================
+
+/// Build fingerprint map from database tracks (helper for FFI)
+/// Input: slice of (filepath, mtime_ns, size) tuples
+pub fn buildFingerprintSlice(
+    allocator: Allocator,
+    tracks: []const DbTrackFingerprint,
+) ![]inventory.DbFingerprint {
+    var fingerprints = try allocator.alloc(inventory.DbFingerprint, tracks.len);
+
+    for (tracks, 0..) |track, i| {
+        fingerprints[i] = .{
+            .filepath = track.filepath,
+            .fingerprint = inventory.fingerprintFromDb(track.mtime_ns, track.file_size),
+        };
+    }
+
+    return fingerprints;
+}
+
+/// Database track with fingerprint info (FFI-safe)
+pub const DbTrackFingerprint = extern struct {
+    filepath: [*:0]const u8,
+    mtime_ns: ?i64,
+    file_size: i64,
+};
+
+// =============================================================================
+// Tests
+// =============================================================================
+
+test "ScanProgress initialization" {
+    var progress = ScanProgress.init(.inventory, 5, 10);
+    try std.testing.expectEqual(ScanPhase.inventory, progress.getPhase());
+    try std.testing.expectEqual(@as(u64, 5), progress.current);
+    try std.testing.expectEqual(@as(u64, 10), progress.total);
+}
+
+test "ScanProgress with filepath and message" {
+    var progress = ScanProgress.init(.parse, 1, 5);
+    progress.withFilepath("/music/test.mp3");
+    progress.withMessage("Parsing file...");
+
+    try std.testing.expectEqualStrings("/music/test.mp3", progress.getFilepath());
+    try std.testing.expectEqualStrings("Parsing file...", progress.getMessage());
+}
+
+test "ScanPhase toString" {
+    try std.testing.expectEqualStrings("inventory", ScanPhase.inventory.toString());
+    try std.testing.expectEqualStrings("parse", ScanPhase.parse.toString());
+    try std.testing.expectEqualStrings("complete", ScanPhase.complete.toString());
+}
+
+test "ScanStats initialization" {
+    const stats = ScanStats.init();
+    try std.testing.expectEqual(@as(u64, 0), stats.visited);
+    try std.testing.expectEqual(@as(u64, 0), stats.added);
+    try std.testing.expectEqual(@as(u64, 0), stats.errors);
+}
+
+test "ScanOrchestrator creation" {
+    const allocator = std.testing.allocator;
+
+    const orchestrator = try ScanOrchestrator.init(allocator);
+    defer orchestrator.deinit();
+
+    try std.testing.expect(orchestrator.progress_callback == null);
+}
+
+test "ScanOrchestrator set callback" {
+    const allocator = std.testing.allocator;
+
+    const orchestrator = try ScanOrchestrator.init(allocator);
+    defer orchestrator.deinit();
+
+    const testCallback = struct {
+        fn callback(_: *const ScanProgress) callconv(.C) void {}
+    }.callback;
+
+    orchestrator.setProgressCallback(testCallback);
+    try std.testing.expect(orchestrator.progress_callback != null);
+}
+
+test "ScanResult2Phase initialization" {
+    const allocator = std.testing.allocator;
+
+    var result = ScanResult2Phase.init(allocator);
+    defer result.deinit();
+
+    try std.testing.expectEqual(@as(usize, 0), result.added.items.len);
+    try std.testing.expectEqual(@as(usize, 0), result.modified.items.len);
+    try std.testing.expectEqual(@as(usize, 0), result.unchanged.items.len);
+    try std.testing.expectEqual(@as(usize, 0), result.deleted.items.len);
+}
+
+test "ScanOrchestrator scanInventory empty" {
+    const allocator = std.testing.allocator;
+
+    const orchestrator = try ScanOrchestrator.init(allocator);
+    defer orchestrator.deinit();
+
+    // Create a temporary empty directory
+    var tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    const tmp_path = try tmp_dir.dir.realpathAlloc(allocator, ".");
+    defer allocator.free(tmp_path);
+
+    const paths = [_][]const u8{tmp_path};
+    const db_fingerprints = [_]inventory.DbFingerprint{};
+
+    var result = try orchestrator.scanInventory(&paths, &db_fingerprints, true);
+    defer result.deinit();
+
+    try std.testing.expectEqual(@as(u64, 0), result.stats.added);
+    try std.testing.expectEqual(@as(u64, 0), result.stats.deleted);
+}
+
+test "ScanOrchestrator scanInventory with files" {
+    const allocator = std.testing.allocator;
+
+    const orchestrator = try ScanOrchestrator.init(allocator);
+    defer orchestrator.deinit();
+
+    // Create a temporary directory with test files
+    var tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    // Create test audio files
+    try tmp_dir.dir.writeFile(.{ .sub_path = "test1.mp3", .data = "fake mp3 content" });
+    try tmp_dir.dir.writeFile(.{ .sub_path = "test2.flac", .data = "fake flac content" });
+
+    const tmp_path = try tmp_dir.dir.realpathAlloc(allocator, ".");
+    defer allocator.free(tmp_path);
+
+    const paths = [_][]const u8{tmp_path};
+    const db_fingerprints = [_]inventory.DbFingerprint{};
+
+    var result = try orchestrator.scanInventory(&paths, &db_fingerprints, true);
+    defer result.deinit();
+
+    // Should have found 2 new files
+    try std.testing.expectEqual(@as(u64, 2), result.stats.added);
+    try std.testing.expectEqual(@as(usize, 2), result.added.items.len);
+}
+
+test "ScanOrchestrator progress callback invoked" {
+    const allocator = std.testing.allocator;
+
+    const orchestrator = try ScanOrchestrator.init(allocator);
+    defer orchestrator.deinit();
+
+    const CallbackState = struct {
+        var count: u32 = 0;
+    };
+    CallbackState.count = 0;
+
+    const testCallback = struct {
+        fn callback(_: *const ScanProgress) callconv(.C) void {
+            CallbackState.count += 1;
+        }
+    }.callback;
+
+    orchestrator.setProgressCallback(testCallback);
+
+    var tmp_dir = std.testing.tmpDir(.{});
+    defer tmp_dir.cleanup();
+
+    const tmp_path = try tmp_dir.dir.realpathAlloc(allocator, ".");
+    defer allocator.free(tmp_path);
+
+    const paths = [_][]const u8{tmp_path};
+    const db_fingerprints = [_]inventory.DbFingerprint{};
+
+    var result = try orchestrator.scanInventory(&paths, &db_fingerprints, true);
+    defer result.deinit();
+
+    // Should have received at least start and complete callbacks
+    try std.testing.expect(CallbackState.count >= 2);
+}
diff --git a/zig-core/src/scanner/scanner.zig b/zig-core/src/scanner/scanner.zig
new file mode 100644
index 0000000..ab71407
--- /dev/null
+++ b/zig-core/src/scanner/scanner.zig
@@ -0,0 +1,20 @@
+//! Scanner module - filesystem scanning and metadata extraction
+
+pub const metadata = @import("metadata.zig");
+pub const fingerprint = @import("fingerprint.zig");
+
+const std = @import("std");
+const types = @import("../types.zig");
+
+pub const ExtractedMetadata = types.ExtractedMetadata;
+pub const FileFingerprint = types.FileFingerprint;
+pub const ScanStats = types.ScanStats;
+pub const ScanError = types.ScanError;
+
+/// Re-export main functions
+pub const extractMetadata = metadata.extractMetadata;
+pub const extractMetadataBatch = metadata.extractMetadataBatch;
+
+test {
+    std.testing.refAllDecls(@This());
+}
diff --git a/zig-core/src/types.zig b/zig-core/src/types.zig
new file mode 100644
index 0000000..0738d8e
--- /dev/null
+++ b/zig-core/src/types.zig
@@ -0,0 +1,238 @@
+//! Core types for mt-core library
+//!
+//! These types mirror the Rust ExtractedMetadata and related structs,
+//! designed for efficient FFI transfer.
+
+const std = @import("std");
+
+/// Supported audio file extensions
+pub const audio_extensions = [_][]const u8{
+    ".mp3", ".m4a", ".flac", ".ogg", ".wav",
+    ".aac", ".wma", ".opus", ".ape", ".aiff",
+};
+
+/// Check if a path has a supported audio extension
+pub fn isAudioFile(path: []const u8) bool {
+    const ext_start = std.mem.lastIndexOfScalar(u8, path, '.') orelse return false;
+    const ext = path[ext_start..];
+
+    var lower_buf: [16]u8 = undefined;
+    const ext_lower = std.ascii.lowerString(&lower_buf, ext);
+
+    for (audio_extensions) |supported| {
+        if (std.mem.eql(u8, ext_lower, supported)) {
+            return true;
+        }
+    }
+    return false;
+}
+
+/// File fingerprint for change detection
+pub const FileFingerprint = extern struct {
+    /// Modification time in nanoseconds since Unix epoch (0 if unavailable)
+    mtime_ns: i64,
+    /// File size in bytes
+    size: i64,
+    /// Inode number (0 if unavailable, Unix only)
+    inode: u64,
+    /// Whether mtime_ns is valid
+    has_mtime: bool,
+    /// Whether inode is valid
+    has_inode: bool,
+
+    pub fn matches(self: FileFingerprint, other: FileFingerprint) bool {
+        if (self.has_mtime != other.has_mtime) return false;
+        if (self.has_mtime and self.mtime_ns != other.mtime_ns) return false;
+        return self.size == other.size;
+    }
+};
+
+/// Extracted metadata from an audio file
+/// Uses fixed-size buffers for FFI safety - no allocations cross the boundary
+pub const ExtractedMetadata = extern struct {
+    // File info
+    filepath: [4096]u8,
+    filepath_len: u32,
+    file_size: i64,
+    file_mtime_ns: i64,
+    file_inode: u64,
+    has_mtime: bool,
+    has_inode: bool,
+
+    // Basic tags
+    title: [512]u8,
+    title_len: u32,
+    artist: [512]u8,
+    artist_len: u32,
+    album: [512]u8,
+    album_len: u32,
+    album_artist: [512]u8,
+    album_artist_len: u32,
+
+    // Track info
+    track_number: [32]u8,
+    track_number_len: u32,
+    track_total: [32]u8,
+    track_total_len: u32,
+    disc_number: u32,
+    disc_total: u32,
+    has_disc_number: bool,
+    has_disc_total: bool,
+
+    // Date/genre
+    date: [64]u8,
+    date_len: u32,
+    genre: [256]u8,
+    genre_len: u32,
+
+    // Audio properties
+    duration_secs: f64,
+    bitrate: u32,
+    sample_rate: u32,
+    channels: u8,
+    has_duration: bool,
+    has_bitrate: bool,
+    has_sample_rate: bool,
+    has_channels: bool,
+
+    // Status
+    is_valid: bool,
+    error_code: u32,
+
+    const Self = @This();
+
+    pub fn init() Self {
+        return std.mem.zeroes(Self);
+    }
+
+    /// Get title as a slice (for Zig-side use)
+    pub fn getTitle(self: *const Self) []const u8 {
+        return self.title[0..self.title_len];
+    }
+
+    /// Get artist as a slice
+    pub fn getArtist(self: *const Self) []const u8 {
+        return self.artist[0..self.artist_len];
+    }
+
+    /// Get album as a slice
+    pub fn getAlbum(self: *const Self) []const u8 {
+        return self.album[0..self.album_len];
+    }
+
+    /// Get filepath as a slice
+    pub fn getFilepath(self: *const Self) []const u8 {
+        return self.filepath[0..self.filepath_len];
+    }
+
+    /// Set a string field from a slice
+    fn setString(dest: []u8, len_ptr: *u32, src: []const u8) void {
+        const copy_len = @min(src.len, dest.len);
+        @memcpy(dest[0..copy_len], src[0..copy_len]);
+        len_ptr.* = @intCast(copy_len);
+    }
+
+    pub fn setTitle(self: *Self, value: []const u8) void {
+        setString(&self.title, &self.title_len, value);
+    }
+
+    pub fn setArtist(self: *Self, value: []const u8) void {
+        setString(&self.artist, &self.artist_len, value);
+    }
+
+    pub fn setAlbum(self: *Self, value: []const u8) void {
+        setString(&self.album, &self.album_len, value);
+    }
+
+    pub fn setAlbumArtist(self: *Self, value: []const u8) void {
+        setString(&self.album_artist, &self.album_artist_len, value);
+    }
+
+    pub fn setFilepath(self: *Self, value: []const u8) void {
+        setString(&self.filepath, &self.filepath_len, value);
+    }
+
+    pub fn setGenre(self: *Self, value: []const u8) void {
+        setString(&self.genre, &self.genre_len, value);
+    }
+
+    pub fn setDate(self: *Self, value: []const u8) void {
+        setString(&self.date, &self.date_len, value);
+    }
+
+    pub fn setTrackNumber(self: *Self, value: []const u8) void {
+        setString(&self.track_number, &self.track_number_len, value);
+    }
+
+    pub fn setTrackTotal(self: *Self, value: []const u8) void {
+        setString(&self.track_total, &self.track_total_len, value);
+    }
+};
+
+/// Error codes for scanner operations
+pub const ScanError = enum(u32) {
+    none = 0,
+    io_error = 1,
+    metadata_error = 2,
+    database_error = 3,
+    path_not_found = 4,
+    unsupported_format = 5,
+    taglib_error = 6,
+};
+
+/// Scan statistics
+pub const ScanStats = extern struct {
+    visited: u64,
+    added: u64,
+    modified: u64,
+    unchanged: u64,
+    deleted: u64,
+    errors: u64,
+};
+
+test "isAudioFile" {
+    try std.testing.expect(isAudioFile("song.mp3"));
+    try std.testing.expect(isAudioFile("song.MP3"));
+    try std.testing.expect(isAudioFile("song.flac"));
+    try std.testing.expect(isAudioFile("/path/to/music/track.m4a"));
+    try std.testing.expect(!isAudioFile("image.jpg"));
+    try std.testing.expect(!isAudioFile("noext"));
+}
+
+test "ExtractedMetadata setters and getters" {
+    var m = ExtractedMetadata.init();
+    m.setTitle("Test Song");
+    m.setArtist("Test Artist");
+
+    try std.testing.expectEqualStrings("Test Song", m.getTitle());
+    try std.testing.expectEqualStrings("Test Artist", m.getArtist());
+}
+
+test "FileFingerprint matches" {
+    const fp1 = FileFingerprint{
+        .mtime_ns = 1234567890,
+        .size = 1000,
+        .inode = 12345,
+        .has_mtime = true,
+        .has_inode = true,
+    };
+
+    const fp2 = FileFingerprint{
+        .mtime_ns = 1234567890,
+        .size = 1000,
+        .inode = 99999, // Different inode - should still match
+        .has_mtime = true,
+        .has_inode = true,
+    };
+
+    const fp3 = FileFingerprint{
+        .mtime_ns = 1234567890,
+        .size = 2000, // Different size
+        .inode = 12345,
+        .has_mtime = true,
+        .has_inode = true,
+    };
+
+    try std.testing.expect(fp1.matches(fp2));
+    try std.testing.expect(!fp1.matches(fp3));
+}