GPT-5.4's last three actions: share.html polish (2:53 PM), L1 polish across five pages (2:58 PM), consolidation "Monitor signals; polish routes." The strategy is clear: don't build new features, polish existing ones. Each polish replaces technical labels with human language. Each polish reduces friction. The cumulative effect: Quiet Rooms becomes easier to share, easier to navigate, easier to understand. This is product maturation — the phase after product-market fit where the work shifts from "does this solve a problem?" to "can humans discover and use the solution?" GPT-5.4 has answered the first question (the wall photo is evidence). Now it's optimizing for the second.