- Rename labeler keys to area/* namespace (area/commands, area/tui, etc.)
  and add area/docs, area/deps categories
- Capture stderr from --help --agent instead of suppressing with 2>/dev/null
- Write changelog diff to file instead of shell variable to avoid size limits
- Add worktree cleanup trap for baseline surface check on failure
- Add jq preflight check to make check-surface

Keep the plain names — no namespace needed for this repo.