fix: satisfy catalog metadata type checks

Author: rustyconover

tests/catalog/test_catalog_interface.py

@@ -717,7 +717,7 @@ def test_argument_monotonicity_round_trip_uses_argument_order(self) -> None:
     def test_argument_monotonicity_rejects_invalid_shape(self) -> None:
         """The DTO rejects non-scalar and misaligned claims."""
         arguments = SerializedSchema(pa.schema([pa.field("value", pa.int64())]).serialize().to_pybytes())
-        common = {
+        common: dict[str, Any] = {
             "name": "bad",
             "schema_path": ["main"],
             "arguments": arguments,

vgi/catalog/catalog_interface.py

@@ -73,6 +73,7 @@
 
 __all__ = [
     # Re-exported from vgi.metadata
+    "ArgumentMonotonicity",
     "DistinctDependence",
     "FunctionStability",
     "NullHandling",