Stability checkpoint — Phase A quality + B-1 QualityReportEndpoint split Validated by svc main pipeline #647 on bd8f073 (green 2026-04-22 ~12:10). Corresponds to MR !135 merge: Phase B-1 (7 parsers) + bin/cluster resplit + Clean Code audit follow-ups + ArchUnit invariants + CI pre-poll fix. See CHANGELOG.md + docs/audit/clean-code-architecture-2026-04-22.md for details.