Remove getattr calls in async transport closing

Add aclose to the AsyncTransport protocol and call it directly
instead of using getattr to check for its existence.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: adamtheturtle

src/vws/async_query.py

@@ -64,9 +64,7 @@ def __init__(
 
     async def aclose(self) -> None:
         """Close the underlying transport if it supports closing."""
-        close = getattr(self._transport, "aclose", None)
-        if close is not None:
-            await close()
+        await self._transport.aclose()
 
     async def __aenter__(self) -> Self:
         """Enter the async context manager."""

src/vws/async_vumark_service.py

@@ -50,9 +50,7 @@ def __init__(
 
     async def aclose(self) -> None:
         """Close the underlying transport if it supports closing."""
-        close = getattr(self._transport, "aclose", None)
-        if close is not None:
-            await close()
+        await self._transport.aclose()
 
     async def __aenter__(self) -> Self:
         """Enter the async context manager."""

src/vws/async_vws.py

@@ -61,9 +61,7 @@ def __init__(
 
     async def aclose(self) -> None:
         """Close the underlying transport if it supports closing."""
-        close = getattr(self._transport, "aclose", None)
-        if close is not None:
-            await close()
+        await self._transport.aclose()
 
     async def __aenter__(self) -> Self:
         """Enter the async context manager."""

src/vws/transports.py

@@ -167,6 +167,10 @@ class AsyncTransport(Protocol):
     and returns a ``Response``.
     """
 
+    async def aclose(self) -> None:
+        """Close the transport and release resources."""
+        ...  # pylint: disable=unnecessary-ellipsis
+
     def __call__(
         self,
         *,