Amazon Q should auto-configure as default chat provider during installation

After installing the Amazon Q extension (v1.91.0), it does not automatically become the default chat provider in VS Code. Users must manually:

1. Navigate through VS Code's settings system
2. Enable chat agents ("chat.agent.enabled": true)
3. Set appropriate request limits ("chat.agent.maxRequests")
4. Potentially modify other conflicting chat provider settings
5. Restart VS Code multiple times

This creates a poor first-time user experience and wastes developer time on configuration instead of coding.

Expected Behavior

The Amazon Q extension should either:

* Automatically configure itself as the default chat provider if no other chat extensions are active
* Prompt during installation: "Make Amazon Q your default chat provider?"
* Provide clear, one-click setup instructions in a welcome screen
* Handle conflicts with other chat providers gracefully

Current Behavior

* Extension installs successfully but chat functionality is not accessible
* No guidance provided on required configuration steps
* Users must discover and manually edit settings.json
* Conflicts with other chat extensions (like GitHub Copilot) are not resolved

Environment

* VS Code: 1.103.2
* Amazon Q Extension: 1.91.0
* OS: Windows 11

Impact

This configuration burden creates unnecessary friction for developers trying to evaluate and adopt Amazon Q, particularly when competing chat tools may have smoother setup experiences.