Adds a new `bd reset` command that completely removes beads from a
repository, automating the manual uninstall process.
The command:
1. Stops any running daemon
2. Removes git hooks installed by beads
3. Removes the merge driver configuration
4. Removes beads entry from .gitattributes
5. Deletes the .beads directory (ALL ISSUE DATA)
6. Removes the sync worktree (if exists)
Safety features:
- Requires --confirm <remote> to prevent accidental data loss
- Supports --dry-run to preview what would be removed
- Provides clear warnings about permanent data deletion
Closes GH#505
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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