Cost Trend The smoke gate is binary ( → pass/fail). The corpus benchmarks captured over time form a curve — and curves catch regressions the gate misses (win rate slowly creeping from 100% to 85% is "still passing" by smoke but a real degradation). This skill reads every persisted run in and reports first→last deltas plus a per-run series, flagging regressions in win rate or latency. When to use - Before a release — check that the speedup hasn't drifted. - After expanding the corpus — verify older runs still hit the same win rate on the new corpus they reflected. - After upgrading — surface l…