fix(platform): govern geospatial analysis and raster handoffs

backend/tests/test_dataset_consumption_gate.py

@@ -190,6 +190,17 @@ def test_passed_manual_or_experimental_dataset_cannot_cross_production_boundary(
     assert "experimental_source_not_allowed_for_purpose" in exc_info.value.details["reasons"]
 
 
+def test_fully_governed_demo_fixture_still_cannot_enter_production_inference() -> None:
+    fixture = _governed_dataset(source_key="fixture", classification="experimental")
+    fixture.source_metadata = {"fixture": True, "usage": "offline demo raster workflow only"}
+
+    with pytest.raises(AppError) as exc_info:
+        DatasetConsumptionGate.assert_eligible(fixture, purpose="production_inference")
+
+    assert exc_info.value.code == "DATASET_PROVENANCE_INCOMPLETE"
+    assert "experimental_source_not_allowed_for_purpose" in exc_info.value.details["reasons"]
+
+
 def test_reference_validation_requires_authoritative_ground_truth_reference() -> None:
     reference = _governed_dataset()
     reference.dataset_type = "vector"