conductor(plan): Mark Phase 5 complete - all phases done

Summary of implementation:
- Phase 1: Tier 4 patch generation (run_tier4_patch_generation)
- Phase 2: Diff parser and renderer (src/diff_viewer.py)
- Phase 3: Patch application with backup/rollback
- Phase 4: Patch modal manager for approval workflow
- Phase 5: 29 unit tests passing

conductor/tracks/tier4_auto_patching_20260306/plan.md

@@ -119,5 +119,5 @@ Focus: Approval modal for patches
       ```
 
 ## Phase 5: Testing
-- [ ] Task 5.1: Write unit tests
-- [ ] Task 5.2: Conductor - Phase Verification
+- [x] Task 5.1: Write unit tests
+- [x] Task 5.2: Conductor - Phase Verification