- queue.zig: Add --rerun <run_id> flag to re-queue completed local runs
- Requires server connection, rejects in offline mode with clear error
- HandleRerun function sends rerun request via WebSocket
- sync.zig: Rewrite for WebSocket experiment sync protocol
- Queries unsynced runs from SQLite ml_runs table
- Builds sync JSON with metrics and params
- Sends sync_run message, waits for sync_ack response
- MarkRunSynced updates synced flag in database
- watch.zig: Add --sync flag for continuous experiment sync
- Auto-sync runs to server every 30 seconds when online
- Mode detection with offline error handling
