fix: require signed evidence provenance

harness/tests/test_registry_evidence_config.py

@@ -128,6 +128,18 @@ def test_signed_http_file_requires_explicit_provenance_urls(tmp_path):
     assert_no_canaries(caught.value)
 
 
+def test_signed_http_file_rejects_explicit_null_provenance(tmp_path):
+    secret_file = tmp_path / "signed-urls.json"
+    secret_file.write_text(json.dumps(["https://evidence.example.test/guide.md"]))
+    path = write_config(tmp_path, {
+        "type": "http", "provenance_urls": None, "signed_urls_file": str(secret_file),
+    })
+
+    with pytest.raises(ConfigError) as caught:
+        load_config(path)
+    assert "provenance" in str(caught.value).lower()
+
+
 def test_public_http_rejects_inline_query_bearing_transport_urls(tmp_path):
     path = write_config(tmp_path, {
         "type": "http",