Add repo-fingerprint check to gt doctor that verifies beads databases have valid repository fingerprints. Missing or empty fingerprints can cause daemon startup failures and sync issues. The check: - Uses bd doctor --json to check fingerprint status - Runs on town-level and rig-level beads directories - Can fix by running bd migrate --update-repo-id - Restarts daemon after migration if it was running 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>