Device and Monitor shared one manual-reset event across all in-flight
IOCTLs, while the session layer runs one goroutine per endpoint: the
first completion released every GetOverlappedResult waiter with the
first operation's byte count, returning before the driver finished
writing the other buffers. Each overlappedIoctl call now owns its
event, making concurrent URBs (and aborts) on one handle safe.
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