Cost Trend

The smoke gate is binary (winRate ≥ 0.80 → 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 docs/benchmarks/runs/*.json 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 agent-booster — surface latency / strategy changes.

Steps

1. Run the trend script from the project root:

   node plugins/ruflo-cost-tracker/scripts/trend.mjs