Propagate All CLI Errors to the UI
Priority: P1
Issue: #6146
Remaining Work
- Intercept CLI error output (stderr) in
ServerManager / KiloConnectionService
- Show VS Code error notification for critical/startup errors
- Inject error messages into chat UI as system messages for mid-session errors
- Ensure CLI's error SSE events are forwarded to the webview and rendered
- Distinguish between startup errors and runtime errors