Harden golden QA readiness gate

scripts/README.md

@@ -23,6 +23,19 @@ datasets, vector FeatureCollection content, vector feature summary, persisted
 QA/QC metrics, creates metadata/report/vector GeoJSON exports, lists exports
 and downloads the JSON/GeoJSON/HTML artifacts through the frontend proxy.
 
+Verify the deterministic QA/QC golden benchmark:
+
+```bash
+bash scripts/verify_golden_qa_benchmark.sh
+python scripts/run_golden_qa_benchmark.py --json
+```
+
+The benchmark uses only explicit local fixtures under `fixtures/golden`,
+executes the existing QA/QC matching logic, verifies the expected precision,
+recall, F1, mean IoU and false-positive/false-negative counts, and checks that
+`QualityCheck` plus `Metric` rows would be persisted. The main readiness gate
+runs this benchmark so QA metric drift fails before a release.
+
 Verify a configured local YOLO model without running inference:
 
 ```bash