CMIS layer into an honest CMIS 1.1

src/kontextual_engine/api/app.py

@@ -534,7 +534,14 @@ class ServiceRuntime:
         expected = properties.pop("expected_current_version_id", payload.get("expected_current_version_id", None))
         for key, value in properties.items():
             if key.startswith("cmis:"):
-                continue
+                raise ValidationError(
+                    "Unsupported CMIS property update",
+                    details={
+                        "property": key,
+                        "operation": "updateProperties",
+                        "supported": ["kontextual:metadata:<key>"],
+                    },
+                )
             self.asset_service().add_metadata_record(
                 asset_id,
                 MetadataRecord(key=_cmis_metadata_key(key), value=value, confirmed=bool(payload.get("confirmed", True))),