- Replace multiple Set-based tracking with explicit SessionStatus state machine
- Implement setTimeout+clearTimeout pattern for robust race condition handling
- SessionStatus tracks: idle → continuation-sent or aborted states
- Increase grace period to 500ms to accommodate event ordering delays
- Add cleanupSession utility for proper resource cleanup
This addresses ESC abort not canceling continuation prompts when session.idle
arrives before session.error event, which can occur due to async event processing
in OpenCode plugin system
YeonGyu-Kim