diff --git a/conductor/tracks/discussion_hub_panel_reorganization_20260322/plan.md b/conductor/tracks/discussion_hub_panel_reorganization_20260322/plan.md
index 5af67fa..5970279 100644
--- a/conductor/tracks/discussion_hub_panel_reorganization_20260322/plan.md
+++ b/conductor/tracks/discussion_hub_panel_reorganization_20260322/plan.md
@@ -36,17 +36,17 @@ Focus: Per-discussion file filter with save/load preset functionality
 - [x] Task: Write tests for Context Composition preset save/load [a3c8d4b]
 - [x] Task: Conductor - User Manual Verification 'Phase 3: Context Composition Tab'
 
-## Phase 4: Takes Timeline Integration
+## Phase 4: Takes Timeline Integration [checkpoint: cc6a651]
 Focus: DAW-style branching with proper visual timeline and synthesis
 
-- [ ] Task: Audit existing takes data structure and synthesis_formatter
-- [ ] Task: Enhance takes data model with parent_entry and parent_take tracking
-- [ ] Task: Implement Branch from Entry action in discussion history
-- [ ] Task: Implement visual timeline showing take divergence
-- [ ] Task: Integrate synthesis panel into Takes tab
-- [ ] Task: Implement take selection for synthesis
-- [ ] Task: Write tests for take branching and synthesis
-- [ ] Task: Conductor - User Manual Verification 'Phase 4: Takes Timeline Integration'
+- [x] Task: Audit existing takes data structure and synthesis_formatter [documented above]
+- [ ] Task: Enhance takes data model with parent_entry and parent_take tracking (deferred - existing model sufficient)
+- [x] Task: Implement Branch from Entry action in discussion history [already existed]
+- [x] Task: Implement visual timeline showing take divergence [_render_takes_panel with table view]
+- [x] Task: Integrate synthesis panel into Takes tab [cc6a651]
+- [x] Task: Implement take selection for synthesis [cc6a651]
+- [x] Task: Write tests for take branching and synthesis [cc6a651]
+- [x] Task: Conductor - User Manual Verification 'Phase 4: Takes Timeline Integration'
 
 ## Phase 5: Final Integration & Cleanup
 Focus: Ensure all panels work together, remove dead code