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2ce359a831
* fix(tcp): stop the read-deadline re-arm from swallowing a cancelled ctx the cancel watchdog trips conn.SetDeadline(now) once. if that trip lands while the probe write is still in flight, readTCP's later SetReadDeadline(now+timeout) call silently overwrote it, so the read blocked for the full timeout instead of returning promptly. thread ctx into readTCP and check it before arming the deadline and on every read iteration so a cancellation already in flight aborts immediately. * test(tcp): make the cancel-during-write test exercise the actual race the old test cancelled ctx before calling ExecuteTCPModule, so the pre-write ctx.Err() guard returned immediately and the test never reached readTCP at all; reverting the fix and rerunning it still passed in ~0ms. cancel from a goroutine mid-write instead, so the watchdog trips the deadline while readTCP is the next call on the path, and assert the call returns promptly rather than blocking for the full timeout. also add a case proving a legitimately slow but uncancelled connection still completes and matches normally.