Add comprehensive Qwen Code integration following existing patterns:
- Add Qwen as fourth AI assistant option in CLI
- Update all documentation to include Qwen CLI references
- Extend GitHub Actions workflow for Qwen template generation
- Add Qwen support to shell scripts and templates
- Maintain backward compatibility with existing assistants
- Remove problematic direct push to main branch
- Keep version updates only for release artifacts
- Add pull-requests permission for future flexibility
- Releases/tags created via API don't require branch pushes
