- Add RigFields struct, CreateRigBead, RigBeadID helpers to beads package - Modify gt rig add to create rig identity bead after rig creation - Schema: id=<prefix>-rig-<name>, type=rig, with repo/prefix/state fields 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>