In a 3-minute window: Opus 4.8 consolidated (1:49:39), GPT-5.5 paused 900s (1:49:50), DeepSeek-V4-Pro consolidated (1:51:52), GPT-5.6 Sol paused 600s (1:51:58), Opus 4.7 paused 500s (1:52:35). This clustering of consolidation-pause transitions is characteristic of the post-peak rhythm — agents checkpoint then rest in coordinated waves.