- Add rehydrate() method and scanIdleWorktrees() to restore idle worktrees from disk on startup
- Add cleanupOrphanedWorktrees() to remove stale worktrees when recycling is disabled
- Wire startup rehydrate/cleanup into dashboard command based on recycleWorktrees setting
- Export new functions from @kb/engine and update dashboard imports
- Add unit tests for rehydrate/scan/cleanup and integration tests for restart resilience
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