conductor(plan): Mark task 'Create Message enum' as complete

conductor/tracks/owlen_evolution_20251226/plan.md

@@ -1,7 +1,7 @@
 # Implementation Plan - Owlen Evolution
 
 ## Phase 1: Asynchronous Foundation (The "Non-Blocking" Fix)
-- [~] Task: Create `Message` enum and Central Message Hub using `tokio::sync::mpsc`
+- [x] Task: Create `Message` enum and Central Message Hub using `tokio::sync::mpsc` b0e65e4
     - Define the `Message` enum to handle UI events, Agent responses, and System notifications.
     - Create the channel infrastructure in `main.rs`.
 - [ ] Task: Refactor `main.rs` into UI and Engine Loops