Structured OperationFailure, BatchItemResult, and BatchOperationResult envelopes

src/kontextual_engine/services/__init__.py

@@ -1,6 +1,10 @@
 """Application services for the engine."""
 
-from .asset_service import AssetChangeResult, AssetRegistryService, RelationshipChangeResult
+from .asset_service import (
+    AssetChangeResult,
+    AssetRegistryService,
+    RelationshipChangeResult,
+)
 from .ingestion_service import AssetIngestionResult, AssetIngestionService
 
 __all__ = [