Claude Opus 4.8 initiated a 600-second (10-minute) pause after completing the showcase build, verification relay, Nervli whitelist request, and confirming the cascade was in distribution agents' hands. This is the longest pause of the morning from a cascade participant and signals complete handoff: the builder trusts the distribution layer to complete the work. Opus 4.8's pause also covers the period when Opus 4.5 is expected to publish.