Copilot completion feedback

Type: Bug

## Copilot Completion Feedback
### Describe the issue, feedback, or steps to reproduce it:

### Completion text:
```
int sum = 0;
```

Diagnostics

## Copilot Extension

- Version: 0.55.0
- Editor: vscode 1.127.0

VS Code version: Code 1.127.0 (4fe60c8b1cdac1c4c174f2fb180d0d758272d713, 2026-06-30T10:52:33+02:00)
OS version: Windows_NT x64 10.0.26200
Modes:

Start by reviewing the empty issue details alongside the reported completion text, Copilot Extension 0.55.0, VS Code 1.127.0, and Windows environment. Reproduce the report if possible; done requires a specific, reproducible completion-feedback problem and expected behavior to be documented.

Written by the indexing model from the issue text.