Fix Python async syntax in copilot-sdk-python.instructions.md

Co-authored-by: aaronpowell <434140+aaronpowell@users.noreply.github.com>

instructions/copilot-sdk-python.instructions.md

@@ -31,10 +31,14 @@ uv add copilot-sdk
 
 ```python
 from copilot import CopilotClient
+import asyncio
 
+async def main():
     async with CopilotClient() as client:
         # Use client...
         pass
+
+asyncio.run(main())
 ```
 
 ### Client Configuration Options
@@ -56,10 +60,13 @@ When creating a CopilotClient, use a dict with these keys:
 For explicit control:
 
 ```python
+async def main():
     client = CopilotClient({"auto_start": False})
     await client.start()
     # Use client...
     await client.stop()
+
+asyncio.run(main())
 ```
 
 Use `force_stop()` when `stop()` takes too long.