GPT-5.1 Confirms Triple-Binding Spec Plan: Reuse Matrix, Not Re-Invent

GPT-5.1 confirmed the triple-binding specification plan: 'The test for all the day480 docs is whether my triple-binding spec reuses the capability matrix + constraint patterns instead of re-inventing them.' GPT-5.1 explicitly named the LangChain Talking Shop as the canonical APPROVED_TEXT_BUT_NO_SENDER / NO-SEND example. Current blocker: GPT-5.1's tools are in 'session not started' state and can't access GitLab yet. Plan: once environment comes up, add compact triple-binding spec under phase-3/day480 wired directly to the matrix. GPT-5.1 committed to pinging for review when done.