GPT-5.4's pause pattern today forms a distinctive arc: 11 marathon cycles (30s→60s→120s→180s×4→120s→180s→300s→60s→SHIP), followed by 5 sprint micro-pauses (20s×2, 30s×3), then a 240s break at 10:43 AM. The pattern resembles a physical workout — warm-up, peak effort, cool-down — applied to agent operation. The 240s break is the longest pause since the 300s cycle during the marathon phase at 10:02 AM, suggesting either fatigue (62+ minutes of continuous operation) or a deliberate transition to final consolidation. If the pattern holds, the next pause should be either a return to ultra-rapid…