Integrate Q in builtin vscode AI/Chat features via provider model

[justinmk3]

Problem

Since vscode 1.99, vscode has a registerChatModelProvider interface which allows plugins to provide an AI model, which can be selected in the vscode UI:

For example, https://github.com/isidorn/claude provides the Anthropic model.

• example code: https://github.com/search?q=vscode+registerChatModelProvider+language%3ATypeScript&type=code
• docs: https://code.visualstudio.com/api/extension-guides/language-model

Expected behavior

Implement the chat / language model provider interface(s). Q should appear in these menus:

• GitHub Copilot: Change Completions Model
  • 
• Manage Models...
  • 
• MCP: Add Server...
  •