B.5.2.0:13.1 - Anomaly statement as canonical prompt

In a constructed service case, latency rises from 8 ms to 40 ms under the same declared workload. The prompt asks what could explain that contrast, names the service and time window, and cites the measurements. Rival explanations may concern contention or a changed cache path; neither is asserted by publishing the prompt. B.5.2 compares their plausibility and may return a qualified conjecture or defer.