v1.91.9.0 feat: test value bar in plan-eng-review, review, qa and ship, plus /test-audit (#2998)

docs/PROJECT_STRUCTURE.md

@@ -49,6 +49,7 @@ gstack/
 ├── ship/            # Ship workflow skill
 ├── review/          # PR review skill (checklist.md is hand-written; design-checklist.md is GENERATED from lib/design-catalog.ts)
 ├── deslop-shared-libs/ # Recommendations-only audit for worthwhile shared-code extractions
+├── test-audit/      # Report-first sweep for low-value tests (test value bar, audit mode)
 ├── plan-ceo-review/ # /plan-ceo-review skill
 ├── plan-eng-review/ # /plan-eng-review skill
 ├── autoplan/        # /autoplan skill (auto-review pipeline: CEO → design → DX → eng, eng always last)