⚡ Bolt: [performance improvement] Replace blocking time.sleep with await asyncio.sleep in async functions

[thirdeyenation]

💡 What: Replaced synchronous time.sleep() calls inside async def methods with await asyncio.sleep() in api/mcp_servers_apply.py and plugins/_code_execution/helpers/shell_ssh.py. Added import asyncio where necessary. Documented the learning in .jules/bolt.md.
🎯 Why: Using synchronous time.sleep() inside asynchronous methods blocks the entire event loop. In the shell_ssh.py connect method, this could block the event loop for up to 5 seconds during retry attempts, severely degrading overall system concurrency and making the application unresponsive to other async tasks.
📊 Impact: Prevents event loop freezing during delays, allowing other asynchronous operations (like handling API requests or websocket messages) to continue executing concurrently.
🔬 Measurement: Verify via pytest tests or by simulating a delayed SSH connection/MCP apply and confirming that other API endpoints remain responsive during the delay.

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PR created automatically by Jules for task 15128892254534048932 started by @thirdeyenation

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