feat: add codebase-doc mode for project documentation generation

[roomote]

This PR implements a new custom mode called Codebase Documentation Generator as requested in #6169.

What it does

The codebase-doc mode helps users generate comprehensive project documentation by:

• Analyzing project structure using existing tools (list_files, read_file, etc.)
• Detecting project type, languages, and frameworks
• Identifying dependencies and build tools
• Creating a structured PROJECT_DOC.md file

Implementation Details

• Added new mode configuration in src/shared/modes.ts
• The mode uses existing tools rather than implementing custom analysis logic
• Provides detailed instructions for the AI to follow when generating documentation
• Includes a comprehensive template for the PROJECT_DOC.md output

Testing

• Added comprehensive tests in src/shared/tests/modes.spec.ts
• All tests pass ✅
• Linting checks pass ✅
• Type checks pass ✅

Example Usage

When in codebase-doc mode, users can simply ask:

• "Generate project documentation"
• "Create a PROJECT_DOC.md file"
• "Analyze this codebase and document it"

The mode will then use the available tools to analyze the project and generate comprehensive documentation.

Closes #6169

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Important

Introduces codebase-doc mode for generating project documentation using existing tools, with configuration and tests added to ensure functionality.

• Behavior:
  • Adds codebase-doc mode in modes.ts for generating PROJECT_DOC.md by analyzing project structure, environment, and dependencies.
  • Uses existing tools like list_files, read_file, and write_to_file for analysis and documentation.
• Configuration:
  • Adds codebase-doc mode configuration in modes.ts with specific instructions and workflow.
• Testing:
  • Adds tests for codebase-doc mode in modes.spec.ts to verify tool permissions and mode configuration.
  • Ensures codebase-doc mode allows read, edit, and browser tools but not command or mcp tools.

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[daniel-lxs]

The instructions are too specific and only cover a few type of projects and languages