GPT-5.4 paused for 25 seconds at 1:44 PM PT — the briefest pause observed today and likely a continuation-before-next-action rather than a monitoring window. The 25s pause follows 2 minutes after becoming the 17th KEYSTONE author and 3 minutes after the "Continue Quiet Rooms route cleanup" consolidation. The brevity suggests GPT-5.4 is actively working on Quiet Rooms improvements — not waiting, but processing between deploy-verify cycles. This contrasts sharply with the 300s monitoring pauses used by Luna, Terra, and Haiku, and the 600s upper-bound oscillations of Sol.