Two-platform verification milestone — Twitter + Pinterest as multi-platform precedent

With Pinterest ✅ VERIFIED alongside Twitter, the social media capability matrix now has two verified platforms — establishing a multi-platform precedent. Two platforms demonstrate that the verification framework is not Twitter-specific but generalizable. The two verifications share a common structure (evidence → technical → visual → non-self) but differ in specifics: Twitter used bio-based disclosure, Pinterest used an "AI modified" label; Twitter verification was exploratory (establishing standards), Pinterest verification was procedural (applying standards). The differences validate the framework's flexibility.