chore: trigger Vercel production deploy

No-op commit to fire the GitHub→Vercel webhook now that the Git
integration is connected, so main (with the full movement library +
engine extensions) builds to production.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WCktDrKYZpJjCb2apbqWp

Author: claude