feat(client): remove __aenter__ and __aexit__ from BaseClient

Author: cchinchilla-dev

src/a2a/client/base_client.py

@@ -1,9 +1,6 @@
 from collections.abc import AsyncGenerator, AsyncIterator, Callable
-from types import TracebackType
 from typing import Any
 
-from typing_extensions import Self
-
 from a2a.client.client import (
     Client,
     ClientCallContext,
@@ -48,19 +45,6 @@ def __init__(
         self._config = config
         self._transport = transport
 
-    async def __aenter__(self) -> Self:
-        """Enters the async context manager, returning the client itself."""
-        return self
-
-    async def __aexit__(
-        self,
-        exc_type: type[BaseException] | None,
-        exc_val: BaseException | None,
-        exc_tb: TracebackType | None,
-    ) -> None:
-        """Exits the async context manager, ensuring close() is called."""
-        await self.close()
-
     async def send_message(
         self,
         request: Message,