docs: record UI workflow observations

Problem: the completed task needed durable notes for subagent Git fallback and explicit browser-QA waivers without expanding the core workflow.

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

@@ -394,3 +394,9 @@ git commit -m "docs: close professional console todo" -m "Problem: the new conso
 - [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.
+
+## Workflow Evolution Observation
+
+- Scoped subagents were effective for TDD implementation and independent review, but some could not write shared Git metadata. The main session should preserve their verified unstaged/staged changes and perform the scoped commit rather than waiting indefinitely.
+- Browser availability is an execution-environment capability. When it is unavailable, record the exact automated/HTTP evidence and an explicit user waiver; never report visual QA as passed.
+- These findings are recorded in this task report rather than expanding `AGENTS.md`: the existing plan-act-observe-update and per-todo commit rules already cover the durable workflow, while the observed limitations are tool-specific.