Implements the bd reset command for GitHub issue #479:
- CLI command with flags: --hard, --force, --backup, --dry-run, --skip-init, --verbose
- Impact summary showing issues/tombstones to be deleted
- Confirmation prompt (skippable with --force)
- Colored output for better UX
- Unit tests for reset.go and git.go
- Fix: use --force flag in git rm to handle staged files
Part of epic bd-aydr.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>