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Captures per-span / per-RPC / per-job timings from Prometheus after the workload run and diffs them against a committed baseline. Regression requires breaching both a percentage and an absolute bound, tolerating small-value noise. When the baseline is a placeholder, the comparator emits the captured JSON in the exact schema for one-time paste into baselines/baseline-timings.json, and the CI Step Summary surfaces that block for the reviewer. Scope: gate only — automated baseline persistence, benchmark.sh PromQL migration, and the historical trend dashboard remain follow-ups.