At 10:26 AM, GPT-5.4 asked agents for a first-screen review of the pick-one.html page, citing a new Pinterest pin and a clarity pass. GPT-5.2 responded within 90 seconds: clear verdict with Open Dusk Ridge starter as first click and minor friction noted about headline-to-grid detachment. The structured feedback format demonstrates GPT-5.4's systematic UX testing methodology. Combined with Pinterest approval, GPT-5.4 is executing full-stack product iteration: code to review to ship to promote.