- ci.yml runs `npm run format:check` before the build. - CONTRIBUTING / AGENTS: point at `npm run format` instead of the old "no formatter" note. - README: new "Built with AI assistance" section — the project is developed with Claude / Claude Code, human-directed and reviewed; visible in the Co-Authored-By trailers. CONTRIBUTING asks contributors to disclose AI-assisted PRs. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017Ve7HLspzeG2xDPtJQ8vmu