Fix timeout handling in CopilotSession

[burkeholland]

Ensure proper timeout management in the CopilotSession class to confirm the process exists upon closure. Clear the timeout immediately after race completes.

[Copilot]

Pull request overview

This PR fixes a memory leak in the sendAndWait method of the CopilotSession class by ensuring the timeout is properly cleared after Promise.race completes. The previous implementation created a timeout but never cleared it when the idle promise resolved first, leaving the timeout callback queued in the event loop.

Changes:

• Added timeout ID tracking to capture the setTimeout return value
• Wrapped Promise.race in a try-finally block to guarantee timeout cleanup
• Added clearTimeout call in the finally block to prevent memory leaks

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.