fix: harden Python workflow client boundary

src/wf_contract_manifest/__init__.py

@@ -22,6 +22,7 @@ def __getattr__(name: str) -> object:
         return generate_manifest
     raise AttributeError(name)
 
+
 __all__ = [
     "ContractManifest",
     "JsonSchema",

src/wf_contract_manifest/__main__.py

@@ -15,7 +15,9 @@ from .model import ManifestError
 
 
 def _parser() -> argparse.ArgumentParser:
-    parser = argparse.ArgumentParser(description="Manage the checked workflow API contract manifest.")
+    parser = argparse.ArgumentParser(
+        description="Manage the checked workflow API contract manifest."
+    )
     parser.add_argument("command", choices=("write", "check"))
     return parser