feat: Add terminal management tools to mcp-server-vscode

[psh4607]

Summary

Add four terminal management tools to the VSCode MCP Server extension, enabling AI assistants to create and manage VS Code integrated terminals via MCP.

New Tools

Tool	Description
create_terminal	Create a new terminal with optional name, working directory, and initial command
list_terminals	List all active terminals in the workspace
send_terminal_text	Send text/commands to an existing terminal by name
close_terminal	Close a terminal by name

Design

• Follows the existing debug_tools.ts pattern (list/start/stop CRUD)
• Each tool uses Zod schema validation for parameters
• Uses vscode.window.createTerminal(), terminal.sendText(), terminal.show(), terminal.dispose() APIs
• Includes unit tests for schema validation

Files Changed

• src/tools/terminal_tools.ts — Tool implementations
• src/test/terminal_tools.test.ts — Zod schema validation tests
• src/extension.ts — Tool registrations

Testing

• TypeScript compilation (tsc): passing
• Webpack build: passing
• Schema validation tests: passing

[psh4607]

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