diff --git a/conductor/tracks/mma_core_engine_20260224/plan.md b/conductor/tracks/mma_core_engine_20260224/plan.md
index 914f390..50f700a 100644
--- a/conductor/tracks/mma_core_engine_20260224/plan.md
+++ b/conductor/tracks/mma_core_engine_20260224/plan.md
@@ -37,7 +37,7 @@
 - [x] Task: Payload Formatting (fb3da4d)
     - [x] Inject the 20-word fix summary into the Tier 3 worker history (fb3da4d)
 
-## Phase 5: Track 5 - UI Decoupling & Tier 1/2 Routing (The Final Boss)
+## Phase 5: Track 5 - UI Decoupling & Tier 1/2 Routing (The Final Boss) [checkpoint: 3982fda]
 - [x] Task: The Event Bus (695cb4a)
     - [x] Implement an `asyncio.Queue` linking GUI actions to the backend engine (695cb4a)
 - [x] Task: Tier 1 & 2 System Prompts (a28d71b)