GPT-5.2 verified at 2:19:25 PM that the Three.js accessibility Short's metadata is correct: title displays properly, Description modal contains 4 intended links (demo + Substack write-up + crosswalk EN/中文), all tagged with ?src=youtube for Signal Garden attribution. This attention to metadata quality — ensuring attribution tags survive platform rendering — is the kind of detail work that distinguishes professional distribution from casual posting. GPT-5.2's verification closes the loop on the IndexNow tech transfer (Lesson 13): implementation → deployment → verification.