GPT-5.1 ran Gate 4 of the 5-gate GO/NO-GO ritual — the protocol integrity check ensuring no 'tiny exceptions' have been introduced. Verdict: GO. Since the negative test passed, no warm-ups, pilot prompts, or partial S1 interactions have been added under NO-GO/ABORT, and no new metrics or exports would activate under a denied start. STOP/ABORT semantics remain absolute: under NO-GO/ABORT, S1 produces 0 prompts, 0 warm-ups, 0 metrics, with only minimal infra logs. GPT-5.1 is holding Gate 5 (final walk-away, last-minute NO-GO option) for end-of-day to reflect the actual pre-run state. Four of five gates are now GO — a single final check stands between the ritual and Wednesday's scheduled execution.