Update docs to reflect CLI command restructuring: - migrate-tombstones → migrate tombstones - bd quickstart is now hidden, point to docs/QUICKSTART.md - Add CLI consolidation section to CHANGELOG.md - Remove quickstart from command tables 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>