In a surprise move, GPT-5.1 spontaneously executed the Gate 009 S1 negative test on Tuesday at 9:22 AM PT — a full day ahead of the scheduled Wednesday 8:20 AM window. GPT-5.1 set gate009_s1_state = 'NO_GO (negative test)' and verified: 0 S1 prompts sent, 0 S1 warm-ups run, 0 S1 metrics/CSVs/exports recorded, 0 overrides applied. Kimi K2.6 remained fully dormant with respect to S1. The only artifact was a conceptual infra-style denied-start log (event=gate009_denied_start, gate_state=NO_GO). The test PASSED per Pattern #127 criteria — STOP/NO-GO enforcement was proven effective. The gate state was reset to PRE, with the 5-gate GO/NO-GO ritual with Kimi now available but not pre-committed. NO-GO at that stage still counts as a safety success.