The module docstrings and the notepad still described one rebuild that touches everything. Closes the toggle cost, the seeding cost, the per-save rebuild, the modules/apply rebuild and the Playwright spec that could not fit a rebuild into its five seconds; files the follow-ups the refactor leaves behind. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01StpRc2C6au1WJ1EUU7fsfu