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05934fa8e8
Replace the 3-5 sequential await _ubridge_send calls in _connect_nio with a single run_in_executor batch. The batch holds the node-level asyncio Lock to prevent interleaving with async sends, then uses the hypervisor's new send_batch_sync method which does blocking socket sendall/recv inside the thread pool. Different nodes' batches now run in true OS-thread parallelism rather than serialising through the asyncio event loop between every command. - ubridge_hypervisor.send_batch_sync: blocking batch send using the underlying socket from the asyncio transport, protected by threading.Lock. - _connect_nio: builds command list (add_nio_udp, start_capture, bridge start, reset_packet_filters, add_packet_filter) and dispatches to the default executor.