Fix file descriptor leak on disconnect#285
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Set zmq.LINGER=0 on ROUTER, PUB, and PUB monitor sockets to ensure immediate socket closure without waiting for pending messages. This prevents file descriptor accumulation during rapid connect/disconnect cycles from the simulator, where the asymmetric LINGER settings between client (LINGER=0) and server (default LINGER=-1) caused lingering connection states.
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Set zmq.LINGER=0 on ROUTER, PUB, and PUB monitor sockets to ensure immediate socket closure without waiting for pending messages. This prevents file descriptor accumulation during rapid connect/disconnect cycles from the simulator, where the asymmetric LINGER settings between client (LINGER=0) and server (default LINGER=-1) caused lingering connection states.