conductor(plan): Mark task 'The Interceptor Loop' as complete

conductor/tracks/mma_core_engine_20260224/plan.md

@@ -30,8 +30,8 @@
     - [x] Provide functionality to mutate the history JSON before resuming execution (1afd9c8)
 
 ## Phase 4: Track 4 - Tier 4 QA Interception
-- [ ] Task: The Interceptor Loop
-    - [ ] Catch `subprocess.run()` execution errors inside `shell_runner.py`
+- [x] Task: The Interceptor Loop (bc654c2)
+    - [x] Catch `subprocess.run()` execution errors inside `shell_runner.py` (bc654c2)
 - [ ] Task: Tier 4 Instantiation
     - [ ] Make a secondary API call to `default_cheap` model passing `stderr` and snippet
 - [ ] Task: Payload Formatting