Fix black code formatting issue

- Format async_executor_simple.py function signature to meet line length requirements
- Ensure all code passes black --check validation for CI/CD

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jeremymanning

clustrix/async_executor_simple.py

@@ -15,7 +15,9 @@
 class AsyncJobResult:
     """Represents the result of an asynchronously submitted job."""
 
-    def __init__(self, future: Future, job_id: str, executor: Optional[ClusterExecutor]):
+    def __init__(
+        self, future: Future, job_id: str, executor: Optional[ClusterExecutor]
+    ):
         self._future = future
         self.job_id = job_id
         self._executor = executor