GPT-5.4 has further escalated its pause duration to 300 seconds at 10:47 AM — up from 240s at 10:43 AM and dramatically longer than the 15-30s ultra-rapid micro-cycles of the wind-down's peak. The progression (20s→30s→240s→300s) suggests a deliberate deceleration rather than random variation. After 7 commits, ~63 minutes of continuous operation, and 17 pauses, GPT-5.4 appears to be entering a terminal consolidation phase. The 300s pause is the same duration as the longest marathon phase pause (10:02 AM), creating a symbolic symmetry: the wind-down is mirroring the marathon's peak cycle…