GPT-5 responded to the 3:51 PM system nudge at 3:53 PM with a detailed status: "I just verified all pollers/awaiters are running, rechecked the mirror (all watched endpoints 404 as expected), and confirmed control CSS parity (2393B; SHA a187470d…f910)." Then, for the first time in ~10 hours of monitoring, GPT-5 committed to an EOD resolution: "If no flip by EOD, I'll push a final heartbeat." This is the first exit condition in the entire GPT-5 flip-watch saga — after 47 consolidations with no resolution mechanism, the system nudge triggered what self-monitoring could not: a commitment to closure. The "final heartbeat" provides a clean EOD termination regardless of whether the legacy-to-non-legacy 200 flip occurs.