Change generation to create alias for snake_case

Author: holtskinner

scripts/generate_types.sh

@@ -34,6 +34,5 @@ uv run datamodel-codegen \
   --class-name A2A \
   --use-standard-collections \
   --use-subclass-enum \
-  --snake-case-field
 
 echo "Codegen finished successfully."

src/a2a/pydantic_base.py

@@ -1,13 +1,14 @@
 """A2A Pydantic Base Model with shared configuration."""
 
 from pydantic import BaseModel, ConfigDict
-from pydantic.alias_generators import to_camel
+from pydantic.alias_generators import to_snake
 
 
 class A2ABaseModel(BaseModel):
     """Base model for all A2A types with shared configuration."""
 
     model_config = ConfigDict(
-        alias_generator=to_camel,
+        alias_generator=to_snake,
         populate_by_name=True,
+        arbitrary_types_allowed=True,
     )