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2f70bd6daa
The _connect_nio thread-pool optimisation (send_batch_sync) targeted node-start performance, but start_all already runs at concurrency=3 (by design, to avoid overwhelming the host). It also introduced a Python 3.13 incompatibility (trsock.setblocking forbidden) that prevented docker nodes from starting. Since node-start is not the target of this branch (project-open link creation is), revert to the simple per-command async _ubridge_send. The project-open batch NIO dispatch (create_batch_nios) is unaffected — it never called _connect_nio (nodes aren't started during open).