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* [client] Wait for signal receive watchdog to stop before reconnect The per-stream watchReceiveStream goroutine was started fire-and-forget and never joined. On reconnect a lingering watchdog could still flip shared client state (receiveStalled, the disconnect notifier) on the freshly established stream, since cancelStream only cancels its own stream context. Track the watchdog with a WaitGroup and wait for it to exit (after cancelling its stream) before the operation returns, so each reconnect starts with no stale watchdog. * [client] Bind signal receive probe to the stream context The watchdog probe reused the generic Send, which derives its per-attempt timeouts from the long-lived client context, so cancelStream could not interrupt an in-flight probe. After joining the watchdog on reconnect, watchdogWg.Wait() could then block for the full send-attempt chain. Split Send into a context-aware send and pass the stream context down through sendReceiveProbe, so cancelStream aborts any in-flight probe and the watchdog exits promptly.