feat(analysis): A-4 regression gate AND + richer baseline - #73
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Default fail requires both a practical percent increase and CI support (fixing the old OR false-alarm path). Baseline schema v2 stores median, CI, n, and optional samples for Cliff's δ diagnostics. Document the policy in plain language for first-year readers in the methodology.
Refresh language Results, violin plots, and dashboard payloads from the prepare-pr full runs used to validate the regression-gate change.
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Summary
reports/regression_report.json;--regression-combineforand|or|….Validation
2026-07-24-201328, python201715, rust201921, c201935, javascript201952, go202008, java202031, cpp202051, swift202115sync-data.pyOK for all 9 languagesNotes
--save-baselineafter merge when you want a clean gate against the new policy (old baselines still load; many host-noise diffs vs pre-shuffle baselines are expected).regression.combine: oror--regression-combine orfor the old, noisier fail mode.reports/baseline.jsonstill reports many regressions — that reflects stale multi-session baselines, not a bug in AND logic.