Add comprehensive 'unpac status' command
Shows the overall state of the workspace including:
- Main worktree status (clean/dirty)
- All projects with merge counts
- All opam packages with patch counts and merge status
- All git repos with patch counts and merge status
- Active worktrees and uncommitted changes
Use `unpac status --short` for a compact summary.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>