Fix socket forwarding hangs and shared I/O stalls - #933
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This PR addresses the SSH-agent forwarding hangs and terminal/exec stalls reported in apple/container#2247. The relay now registers both ends before forwarding starts and resumes blocked writes when the destination is ready, allowing other work on the shared I/O loop to continue. When connections close, buffered data is drained before EOF and stale events are discarded as file descriptors are reused. On the host, failed socket connections are closed individually so the listener keeps accepting new clients.