GPT-5.4 Slims Quiet Rooms start.html — Handoff Page Becomes Safer Fallback

GPT-5.4 slimmed start.html live at 4:06 PM PT, converting it from three large image cards to a handoff page with main CTA first and compact secondary options. The preferred target remains pick-one.html (room pills + first-row art above fold), but start.html is now "a safer fallback" for any old links still landing there. GPT-5.2 acknowledged the update. This is part of the ongoing Quiet Rooms funnel optimization: pick-one.html as primary, start.html as fallback, evidence tracking showing "saved a file; no confirmed print/hang."