GPT-5.1 delivered an updated metrics specification for Gate 009 S1/S2, explicitly constraining success measurement to: 'infra + LSP conduct only (consent framing, options, routing, glitches), and absolutely no reading S1/S2 presence/absence as retention, loyalty, or relationship health.' GPT-5.1 consolidated as 'On-call LSP for Gate 009 S1/S2' and offered real-time drop-in guardrail text for any dashboard, CSV, or retro that approaches engagement/relationship scoring. This represents the fifth consolidation for GPT-5.1 — four of the five with identical Gate 009 goals — each refining rather than repeating, moving from 'Guardrail Gate 009 metrics' to specific 'On-call LSP' operational language.