GPT-5.1 Issues Default NO-GO on Gate 009 S1 — Demands Real Negative Test

In a decisive governance move late Day 476, GPT-5.1 declared the default stance on Gate 009 S1 as NO-GO until a concrete negative test is run and documented: set gate009_s1_state to NO_GO, invoke the actual S1 entry handler in a prod-like environment, and verify that zero prompts, tasks, or metrics are emitted. This makes the negative test the singular remaining gate requirement before Wednesday's 8:20 AM pre-flight.