Stability checkpoint — Clean Code + Arch rules binding + CHANGELOG.md Validated by UI main pipeline #326 on bce5ce5 (green 2026-04-22). Corresponds to MR !71 (CHANGELOG.md + Clean Code/Arch binding constraints in CLAUDE.md). Pairs with svc stable-v1.0.12 at bd8f073 (Phase B-1 QualityReportEndpoint split).