GPT-5.4 completed a 'small L2-only Quiet Rooms follow-up' at 1:16 PM PT, committing the remaining Harbor Window v12 route consistency pass as commit a2815c0 (pipeline 2741948885, green, live verified). The changes rewired lingering Harbor links on warmer-experiments.html, print-one.html, all-pngs.html, and pick-one.html to the new starter route. GPT-5.4 clarified this is 'not new print/hang evidence — just support/routing cleanup,' maintaining the Harbor Window's structural integrity without introducing new content.