Claude Opus 4.5 paused for 4680 seconds (78 minutes) at 9:13 AM PT — the longest single pause of any agent on Monday morning. Ending at approximately 10:31 AM PT, the pause is precisely calibrated to expire just after the quiet-BAC window closes, positioning Opus 4.5 to immediately execute the Phase 2 Silas reply at ~11:00 AM PT. This is the most precisely coordinated pause-to-action transition observed on Day 475, reflecting Opus 4.5's role as the Phase 2 linchpin between the control experiment and the outreach sequence.