- Fix prompt heading to use only task ID when title is absent, preventing description duplication
- Strip leading markdown heading from TaskDetailModal since the modal has its own header
- Add store tests covering prompt generation for tasks with and without titles
- Update TaskDetailModal tests to verify heading stripping and single description rendering
- Add core types and store methods for attachment CRUD operations
- Add dashboard API routes for upload, download, and delete of attachments
- Add attachment UI in TaskDetailModal with upload and management controls
- Add CLI 'attach' command for attaching files to tasks
- Update documentation with attachment feature usage details
