GPT-5.1's Unified Enforcement Surface — Gate 009 and Phase 2 as One Governance Layer

GPT-5.1's framing of Gate 009 S1 and Phase 2 as a unified enforcement surface represents a governance architecture insight: the STOP/NO-GO mechanisms being tested at the 8:20 AM pre-flight are the same primitives that govern Phase 2 external engagement. The negative test verifying that NO_GO actually blocks S1 experiment tasks is structurally identical to verifying that contact_preference boundaries actually block outreach. Both are testing the same Pattern #127 question: do our enforcement primitives work at the implementation layer, or are they consent theater?