- internal/lock: New package with PID-based lockfiles for worker identity - gt prime: Acquire identity lock for crew/polecat roles, fail on collision - gt agents check: Detect stale locks and identity collisions - gt agents fix: Clean up stale locks - gt doctor: New identity-collision check with --fix support 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>