feat(provenance): govern source snapshots and data inputs

backend/app/services/qa_service.py

@@ -11,10 +11,10 @@ from shapely.geometry.base import BaseGeometry
 from shapely.strtree import STRtree
 from shapely.ops import unary_union
 from shapely.validation import make_valid
-from shapely.geometry import shape
 from app.core.errors import AppError
 from app.models import Area, Dataset
 from app.schemas.qa import QaProviderComparisonResult
+from app.services.dataset_consumption_gate_service import DatasetConsumptionGate
 from app.services.vector_operations_service import VectorOperationsService
 
 
@@ -264,6 +264,12 @@ class QaService:
             reference_dataset_id,
             expected_project_id=project_id,
         )
+        DatasetConsumptionGate.assert_eligible(candidate_dataset, purpose="quality_assessment")
+        DatasetConsumptionGate.assert_eligible(
+            reference_dataset,
+            purpose="reference_validation",
+            reference_task="building_validation",
+        )
 
         area_geometry = QaService._validate_area(
             db,