The review rejected the v8-ignore defense for the ack gate: a forged second
boot-ack is deterministically constructible (one os.write on fd 3) and the
run-write failure is deterministically constructible with the boot-write-failure
mock pattern. A program that forges an extra boot-ack asserts the run still
completes once (the gate does not re-send the run frame); a mocked child whose
fd-3 pipe accepts the boot frame but rejects the run write resolves a
worker-exit.
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