- Rename @kb/core, @kb/dashboard, @kb/engine to @fusion/* namespace
- Update all import statements across 143+ files to use new package names
- Update workspace dependencies and root package.json references
- Fix bundler configurations (tsup, vite) for new package names
- Update test files and fix typecheck issues
- Add changeset file documenting the package rename
- Add backend subtask breakdown session management and API endpoints
- Create SubtaskBreakdownModal component for generating AI-suggested subtasks
- Integrate subtask breakdown into QuickEntryBox and NewTaskModal flows
- Add frontend API client functions for breakdown sessions and subtask creation
- Add tests for SubtaskBreakdownModal and backend routes
- Create changeset documenting the subtask breakdown feature