- Add internal/deps package for dependency management
- Check for bd before gt install and gt rig add
- Auto-install bd via go install if missing
- Version check warns if bd is too old (min: 0.43.0)
Closes#22🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
