CMIS layer into an honest CMIS 1.1

tests/cmis/test_cmis_browser_binding_api.py

@@ -100,6 +100,8 @@ def test_cmis_repository_info_and_type_definitions(cmis_client) -> None:
     assert repository["repository_id"] == "kontextual-readonly-browser"
     assert repository["cmis_version_supported"] == "1.1"
     assert repository["capabilities"]["capability_query"] == "metadataonly"
+    assert repository["capabilities"]["capability_get_descendants"] is False
+    assert repository["unsupported_features"]["multifiling"]["status"] == "projection_only"
     assert {item["base_type_id"] for item in types["items"]} >= {
         "cmis:document",
         "cmis:folder",
@@ -208,3 +210,14 @@ def test_cmis_readonly_route_rejects_mutation(cmis_client) -> None:
     )
 
     assert response.status_code == 403
+
+
+def test_cmis_rejects_unsupported_standard_property_update_with_diagnostics(cmis_client) -> None:
+    response = cmis_client.post(
+        "/cmis/governed-authoring/browser/object/cmis:asset:asset-source/properties",
+        json={"properties": {"cmis:name": "Renamed"}},
+    )
+
+    assert response.status_code == 422
+    assert response.json()["detail"]["details"]["property"] == "cmis:name"
+    assert response.json()["detail"]["details"]["supported"] == ["kontextual:metadata:<key>"]