INT4 ConvRot W4A4 conversions for Krea2, Qwen-Image on ComfyUI

A Reddit user converted several image generation models to INT4 ConvRot W4A4 quantization for ComfyUI. Includes Krea2 (Turbo/Raw), Qwen-Image 2512, Qwen-Image-Edit 2511, and FireRed-Image-Edit 1.1.