diff --git a/conductor/tracks/gui2_parity_20260224/plan.md b/conductor/tracks/gui2_parity_20260224/plan.md
index 2dbd1cb..0725c2c 100644
--- a/conductor/tracks/gui2_parity_20260224/plan.md
+++ b/conductor/tracks/gui2_parity_20260224/plan.md
@@ -32,7 +32,7 @@ Ensure `gui_2.py` meets performance requirements and passes all quality gates.
 ## Phase 4: Deprecation and Cleanup
 Finalize the migration and decommission the original `gui.py`.
 
-- [ ] Task: Rename `gui.py` to `gui_legacy.py`.
+- [x] Task: Rename gui.py to gui_legacy.py. [c4c47b8]
 - [ ] Task: Update project entry point or documentation to point to `gui_2.py` as the primary interface.
 - [ ] Task: Final project-wide link validation and documentation update.
 - [ ] Task: Conductor - User Manual Verification 'Phase 4: Deprecation and Cleanup' (Protocol in workflow.md)