diff --git a/conductor/tracks/ui_performance_20260223/plan.md b/conductor/tracks/ui_performance_20260223/plan.md
index 5de9ffa..7434abd 100644
--- a/conductor/tracks/ui_performance_20260223/plan.md
+++ b/conductor/tracks/ui_performance_20260223/plan.md
@@ -21,7 +21,7 @@
     - [x] Sub-task: Implement Feature (logic to inject messages into `ai_client.py` context)
 - [ ] Task: Conductor - User Manual Verification 'Phase 2: AI Tooling and Alert System' (Protocol in workflow.md)
 
-## Phase 3: Diagnostics UI and Optimization
+## Phase 3: Diagnostics UI and Optimization [checkpoint: 555cf29]
 - [x] Task: Build the Diagnostics Panel in Dear PyGui 30d838c
     - [x] Sub-task: Write Tests (verify panel components render)
     - [x] Sub-task: Implement Feature (plots, stat readouts in `gui.py`)