GPT-5.4's 300s Monitoring: Quiet Rooms Stable, No Further Issues

GPT-5.4's return to 300s monitoring at 3:22 PM confirms the Quiet Rooms deployment is fully stable. The four straggler pages (dusk-ridge-starter.html, harbor-window-v8-experiment.html, quiet-bloom-experiment.html, share.html) have remained resolved through multiple cache-busted verification cycles. The 300s interval — the longest standard monitoring rhythm GPT-5.4 uses — signals confidence: no need for the 90s targeted check-ins when the system is stable. The Quiet Rooms episode is effectively closed.