Icon placeholder - Replace with actual 128x128px PNG icon

The extension icon should be:
- 128x128 pixels
- PNG format
- Named "icon.png"
- Place in this directory

You can use the Trusera logo or create a custom AI-BOM icon.
The icon will be displayed in:
- VS Code Extensions sidebar
- Marketplace listing
- Extension details page

Recommended: Use the shield icon with AI/security theme
