feat: run-to-run delta comparison in CI summary#22
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Add run history tracking via GitHub Actions Cache so future runs can compare against previous results without external services. Includes HistoryStorage interface, ActionsCacheStorage implementation, HistoryManager with size guards, and integration into the main entry point.
v6 only exports ESM which ncc cannot bundle. v4 has a CJS main entry and the same restoreCache/saveCache API surface.
Adds a "Changes Since Last Run" section to the GitHub Actions CI summary when history has 2+ entries. Compares tests by suite::name composite key to detect added, removed, newly failing, and newly passing tests. Pass rate and duration deltas are always shown for reference.
Comparison now groups tests by composite key and tracks counts per status, correctly detecting added/removed when duplicates exist. hasChanges is true when pass rate or duration changed, even if no test-level changes occurred.
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Summary
Adds a "Changes Since Last Run" section to the GitHub Actions CI job summary. When history contains a previous run on the same branch, the summary shows which tests were added, removed, newly failing, or newly passing — plus pass rate and duration deltas.
Changes
src/history/comparison.ts(new) — purecomputeDelta()function usingsuite::namecomposite keys with count-based grouping for correct duplicate test handlingsrc/history/types.ts— addedDeltaComparisonandDeltaTestInfotypessrc/output/summary.ts— addedrenderDeltaSection(), extendedSummaryOptionswith optionaldeltafieldsrc/index.ts— computes delta aftersaveHistory(), wrapped in try/catch (errors usecore.debug()only)hasChangesreflects both test-level and aggregate metric changes (pass rate, duration)Test plan