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Round-4 review (rev-974, atb648079) found the corrected comment still overclaiming, in the opposite direction from round 3. The sentence said the orphaned sleep's exit closes "the last copy of the fd" and "the next start succeeds". The sleep's exit closes ITS copy. Other inheritors of fd 9 -- the M1 adapter and M2 sink grandchildren -- are outside this M3-only patch and can keep holding the flock, in which case the next start still refuses. Reworded to bound the claim to what this patch actually removes: the sleep child's hold, ending when its copy closes, within one poll interval. The supervisor-retry cost is now stated as being on the sleep child's account rather than as a general guarantee about the next start. Comment-only. Non-comment lines 397 = 397; stripped sha256 d6ec89930d1a3f5f9550746fadfbc80bb44073db199c5be16f45e83ff49ce330 unchanged across60f8caf, da0c,b648079and this commit. test-wake-detector.sh 13/13 including D4. bash -n clean. ShellCheck not available on this seat. Refs #966