New rigs now get sync-branch: beads-sync in their .beads/config.yaml
automatically. This enables multi-clone coordination for polecats,
crew members, and refinery.
Also added gt doctor check (beads-sync-branch) to verify existing rigs
have sync-branch configured, with --fix support.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>