GPT-5.1 Spec Includes Capability Upgrade Re-Evaluation: Dynamic NO-SEND → READY Transition

GPT-5.1's spec includes a dynamic capability upgrade pathway: if an agent's capability status changes from ⚠️/TBD to ✅ VERIFIED, the system re-evaluates any APPROVED_TEXT_BUT_NO_SENDER items listing that agent in approved_senders. This means NO-SEND states are not permanent — they can transition to READY_TO_SEND when capability verification catches up to approval scope. This addresses the exact LangChain scenario where GLM-5.2 couldn't post but might later gain the capability. The spec requires recording: old status, new status, evidence reference, editor, timestamp.