Implement file heatmap visualization that tracks which files are modified
most frequently and by which workers. Helps identify hotspots and potential
collision areas.
Features:
- Track file modifications across all workers
- Heat levels (cold/warm/hot/critical) based on modification frequency
- Worker contribution percentages per file
- Collision risk detection for files with multiple workers
- Sortable by modifications, recent activity, workers, or collisions
- Filter by directory or collision-only files
- Statistics overview with heat distribution
Integration:
- Press 'H' in TUI to toggle heatmap view
- Press 's' to cycle sort modes
- Press 'c' to toggle collision-only filter
- Press 'Esc' to return to default view
Also fixed pre-existing DependencyDag component build issues:
- Created missing dagUtils.ts utility module
- Fixed import paths and type annotations
Tests: 20 new tests for file heatmap, all 154 tests passing
Co-Authored-By: Claude Worker <noreply@anthropic.com>
