diff --git a/conductor/tracks/owlen_evolution_20251226/plan.md b/conductor/tracks/owlen_evolution_20251226/plan.md
index 2852778..7016e4d 100644
--- a/conductor/tracks/owlen_evolution_20251226/plan.md
+++ b/conductor/tracks/owlen_evolution_20251226/plan.md
@@ -10,7 +10,7 @@
 - [x] Task: Switch LLM interaction to Streaming-only c54962b
     - Update the LLM client to use streaming responses.
     - Ensure the UI updates incrementally as tokens arrive.
-- [ ] Task: Introduce `Arc<Mutex<AppState>>` for shared state
+- [x] Task: Introduce `Arc<Mutex<AppState>>` for shared state 2bccb11
     - Create `AppState` struct to hold conversation history, current mode, etc.
     - Share it between UI and Engine loops safely.
 - [ ] Task: Conductor - User Manual Verification 'Phase 1: Asynchronous Foundation (The "Non-Blocking" Fix)' (Protocol in workflow.md)