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v0.2.0 — quality upgrade: SDXL, FreeU, ESRGAN, VAE

Image generation improvements:
  - Juggernaut XL v9: best photorealism model, no hallucinations
  - Realistic Vision V6: fast SD 1.5 photorealism fine-tune
  - SDXL auto-detection by checkpoint name — correct resolutions/CFG/
    scheduler applied automatically
  - --quality fast|normal|high|ultra presets (separate tables for
    SD 1.5 and SDXL)
  - FreeU v2 enabled by default (free detail boost)
  - External VAE support (vae-ft-mse-840000 for better SD 1.5 colours)
  - ESRGAN pixel upscaler in hi-res fix (4x-UltraSharp, sharper than bislerp)
  - CLIP skip control
  - --list-vae / --list-upscalers commands

Models added to ComfyUI:
  checkpoints/Juggernaut-XL-v9.safetensors      (6.7 GB, SDXL)
  checkpoints/Realistic_Vision_V6.safetensors   (4.0 GB, SD 1.5)
  upscale_models/4x-UltraSharp.pth              (64 MB)
  vae/vae-ft-mse-840000.safetensors             (320 MB)