diff --git a/conductor/tracks/mma_core_engine_20260224/plan.md b/conductor/tracks/mma_core_engine_20260224/plan.md
index 8c64bbf..4ed5bd7 100644
--- a/conductor/tracks/mma_core_engine_20260224/plan.md
+++ b/conductor/tracks/mma_core_engine_20260224/plan.md
@@ -21,8 +21,8 @@
     - [x] Implement `ticket.mark_blocked()`, `ticket.mark_complete()`, `track.get_executable_tickets()` (e925b21)
 
 ## Phase 3: Track 3 - The Linear Orchestrator & Execution Clutch
-- [ ] Task: The Engine Core
-    - [ ] Create `multi_agent_conductor.py` containing `ConductorEngine` and `run_worker_lifecycle`
+- [x] Task: The Engine Core (7a30168)
+    - [x] Create `multi_agent_conductor.py` containing `ConductorEngine` and `run_worker_lifecycle` (7a30168)
 - [ ] Task: Context Injection
     - [ ] Format context strings using `file_cache.py` target AST views
 - [ ] Task: The HITL Execution Clutch