docs: record professional console merge

Problem: the Todo 53 implementation plan still showed local merge as pending after the verified fast-forward integration.

docs/plans/todo-53-professional-debug-console-ui.md

@@ -391,6 +391,6 @@ git add README.md docs/plans/todos.md docs/plans/todo-53-professional-debug-cons
 git commit -m "docs: close professional console todo" -m "Problem: the new console and EventPrompt contract need durable guidance and verification evidence."
 ```
 
-- [ ] **Step 7: Final clean-state check and local merge**
+- [x] **Step 7: Final clean-state check and local merge**
 
 Run `git status --short` and `git log -5 --oneline`. Merge the verified feature branch locally into `codex/agent-lab-mvp`, then rerun the full automated gate on the merged branch.