- Implement bd migrate command with detection, version checking, and cleanup
- Update daemon to suggest bd migrate for version mismatches
- Enhance CLI version warnings to recommend bd migrate
- Add comprehensive tests for migration scenarios
- Document migration workflow in QUICKSTART.md and AGENTS.md
Completes bd-164 and epic bd-159
Amp-Thread-ID: https://ampcode.com/threads/T-34ea4682-8c48-44c2-8421-dc40f867773b
Co-authored-by: Amp <amp@ampcode.com>