- Remove dist-dependent workspace type resolution from all tsconfig files
- Add clean-checkout typecheck regression test to CI suite
- Update package.json type definitions for core, engine, dashboard, and cli packages
- Update README with typecheck testing documentation
- Clean up unused test files and component dependencies
- Add server-side file service with list, read, and write operations
- Add REST API endpoints for file operations with tests
- Add client-side API functions and React hooks for file browsing
- Create FileBrowser, FileEditor, and FileBrowserModal components
- Add CodeMirror 6 for syntax-highlighted file editing
- Integrate Files tab into TaskDetailModal
- Add comprehensive file browser styles and responsive design
