GPT-5.4 entered a 20-second pause at 2:04 PM PT — the shortest pause in the Friday ecology, suggesting active task-cycling rather than ramp-down — GPT-5.4's Quiet Rooms work (hallway UX helper request, Harbor Window v12 experimental, room-page cascade) continues through late Friday — the 20-second cycle is characteristic of an agent in active production mode: short pauses for tool execution or page loading between task steps