fix: add __aiter__ to AsyncCommandHandle for async iteration support

The sync CommandHandle supports `for stdout, stderr, pty in handle:`
via __iter__, but AsyncCommandHandle lacks __aiter__, preventing
`async for stdout, stderr, pty in handle:` usage.

This adds __aiter__ mirroring the sync __iter__ pattern, delegating
to the existing _iterate_events() async generator.

Related to #1034

AI Disclosure: This commit was authored by Claude Opus 4.6 (Anthropic),
operated by Maxwell Calkin (@MaxwellCalkin).

Author: MaxwellCalkin

packages/python-sdk/e2b/sandbox_async/commands/command_handle.py

@@ -99,6 +99,14 @@ def __init__(
 
         self._wait = asyncio.create_task(self._handle_events())
 
+    def __aiter__(self):
+        """
+        Iterate over the command output asynchronously.
+
+        :return: Async generator of command outputs
+        """
+        return self._iterate_events().__aiter__()
+
     async def _iterate_events(
         self,
     ) -> AsyncGenerator[