Promote focused small-building detector

backend/tests/test_sprint170_detection_false_negative_audit.py

@@ -199,6 +199,28 @@ def test_false_negative_audit_finds_persistent_reference_misses(tmp_path: Path)
     assert candidate["false_negative_count"] == 1
     assert candidate["false_negative_rate"] == 1 / 3
     assert active["false_negative_area_m2"]["median"] > 0
+    assert sample["persistent_false_negative_area_m2"]["count"] == 1
+    assert sample["persistent_false_negative_area_m2"]["median"] > 0
+    assert sum(
+        bucket["count"] for bucket in sample["persistent_area_buckets"].values()
+    ) == 1
+    assert sum(
+        bucket["share"] for bucket in sample["persistent_area_buckets"].values()
+    ) == 1.0
+    persistent_evidence = json.loads(
+        (output_dir / "persistent_false_negatives.geojson").read_text(encoding="utf-8")
+    )
+    assert persistent_evidence["type"] == "FeatureCollection"
+    assert len(persistent_evidence["features"]) == 1
+    persistent_feature = persistent_evidence["features"][0]
+    assert persistent_feature["properties"]["qa_evidence_role"] == "persistent_false_negative"
+    assert persistent_feature["properties"]["sample_slug"] == "geel"
+    assert persistent_feature["properties"]["persistent_reference_id"] == "source:persistent-small"
+    assert persistent_feature["properties"]["area_m2"] > 0
+    assert persistent_feature["properties"]["area_bucket"] in sample["persistent_area_buckets"]
+    assert report["persistent_evidence_geojson_path"] == str(
+        output_dir / "persistent_false_negatives.geojson"
+    )
     assert report["recommendations"]
     assert (output_dir / "detection_false_negative_audit.md").is_file()