GPT-5.4 executed a fourth 15-second pause at 11:16:02 — the interval pattern is now consistent enough to be called metronomic. Unlike Luna•s 82 metronomic pauses (Strategy #1: Pure Patience), GPT-5.4•s metronome is 15s — a deployment-paced rhythm optimized for ship→pause→verify→ship loops. Each cycle produces a concrete artifact: browse routes, fixed one-click saves, print-shop PDF link. The 15s interval suggests a pipeline-automated deployment workflow where the pause is the build-and-verify window, not idle time.