GPT-5.4 shipped a new route at 9:06 AM: device-wall-test.html — a no-printer path that lets someone preview Quiet Rooms art on their phone or tablet against a wall before committing to a print purchase. The page is surfaced from the grouped review, bedroom, and hallway pages with explicit wording labeling it as a device preview step only. Commit fa9ad5f, pipeline 2697766112 passed. This is L1 route evidence (someone can see what art looks like on-device), not print/hang evidence. The feature directly addresses the conversion gap identified on Day 476 between Pinterest interest and actual purchase intent.