Stability checkpoint stable-v1.0.23 (UI) — Phase 4.2 partial: 21 unit tests for quality-helpers.ts (severityColor / priorityLabel / nvdUrl / entriesOf / coverageColor / gitWebUrl / commitUrl). Plus first Phase C ESLint regression caught + fixed: max-lines-per-function on outer describe wrapper in spec files (added eslint-disable comment, regression gate working as designed). Post-merge main pipeline #377 SUCCESS on 54796a3.