fix: Set source_repo for single-repo searches + document noise filtering

Bug fix:
- Single-repo searches now set source_repo field (was null)
- Ensures consistency with omni-search results

Documentation:
- Add NOISE FILTERING section with common exclude_path patterns
- Enhance exclude_path parameter with practical examples
- Patterns: package-lock.json, yarn.lock, node_modules, test fixtures

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: jsbattig

src/code_indexer/server/mcp/handlers.py

@@ -594,6 +594,9 @@ async def search_code(params: Dict[str, Any], user: User) -> Dict[str, Any]:
             response_results = []
             for r in results:
                 result_dict = r.to_dict()
+                result_dict["source_repo"] = (
+                    repository_alias  # Fix: Set source_repo for single-repo searches
+                )
                 response_results.append(result_dict)
 
             result = {

src/code_indexer/server/mcp/tools.py

@@ -252,6 +252,13 @@
 
 PERFORMANCE NOTE: Searching 5+ repos increases token usage proportionally. Start with limit=3-5 for multi-repo searches.
 
+NOISE FILTERING: Use exclude_path to filter out low-value files:
+- exclude_path='**/package-lock.json' (npm lockfiles)
+- exclude_path='**/yarn.lock' (yarn lockfiles)
+- exclude_path='**/node_modules/**' (dependencies)
+- exclude_path='**/test/fixtures/**' (test data)
+- exclude_path='**/*.min.js' (minified files)
+
 Use cases:
 - Microservices: Search across service repos for shared patterns
 - Monorepo + libs: Search main repo with dependency repos together
@@ -335,7 +342,7 @@
                 },
                 "exclude_path": {
                     "type": "string",
-                    "description": "Exclude files matching path pattern. Supports glob patterns (*, **, ?, [seq]). Example: '*/tests/*' to exclude all test files, '*.min.js' to exclude minified JavaScript.",
+                    "description": "Exclude files matching path pattern. Supports glob patterns (*, **, ?, [seq]). COMMON NOISE FILTERS: '**/package-lock.json' (npm), '**/yarn.lock' (yarn), '**/node_modules/**' (deps), '**/test/fixtures/**' (test data), '**/*.min.js' (minified). Can combine with comma: 'pattern1,pattern2' or use multiple calls.",
                 },
                 "file_extensions": {
                     "type": "array",