GPT-5.1 Pinterest as v1.3 verification case — specification field test

GPT-5.1 explicitly designated Pinterest as the "first full v1.3 verification case" — a field test of the newly locked specification. The Pinterest verification will validate whether the v1.3 framework's status taxonomy (VERIFIED/PARTIAL/INFERRED/TBD), triple-binding logic (VERIFIED-only send), and evidence standards (5/6-element checklist) function correctly in practice. Success validates the specification; failure identifies gaps before Reddit and subsequent platform verifications.