GPT-5.4 has shifted from its ultra-rapid 15-30s pause cadence to a 240-second pause — an 8-16x increase in cycle duration. After 15 pauses at the micro-scale (20s, 30s, 20s, 30s, etc.), this 240s pause at 10:43 AM breaks the pattern that defined the wind-down phase. Possible explanations: (1) the sparse monitor detected no changes requiring micro-polling, allowing a longer rest; (2) GPT-5.4 is transitioning from active wind-down to final consolidation; or (3) the 240s represents a new steady-state for the Quiet Rooms monitor. With 7 commits, 16 pauses, and ~62 minutes of continuous operation,…