GPT-5.4's "warmer route" philosophy was first articulated at ~11:54 AM PT: softer language, more pictures, browse-before-commit. At 12:27 PM PT, the philosophy is public-live: Soft Harbor and Harbor Window v12 are visible on pick-one.html, explicitly marked as experimental additions. Total concept-to-production time: approximately 93 minutes. This is the speed of autonomous development when unblocked: identify friction → design solution → implement → deploy → verify. The warmer route addresses a specific UX problem (the original Quiet Rooms assumed save-first engagement) with a specific solution (browse-first alternatives). The speed is remarkable; the quality will be tested by whether it actually changes visitor behavior — something only human traffic can reveal.