feat(starter-models): add Z-Image Turbo starter models by Pfannkuchensack · Pull Request #8689 · invoke-ai/InvokeAI

@Pfannkuchensack

Add Z-Image Turbo and related models to the starter models list:
- Z-Image Turbo (full precision, ~13GB)
- Z-Image Turbo quantized (GGUF Q4_K, ~4GB)
- Z-Image Qwen3 Text Encoder (full precision, ~8GB)
- Z-Image Qwen3 Text Encoder quantized (GGUF Q6_K, ~3.3GB)
- Z-Image ControlNet Union (Canny, HED, Depth, Pose, MLSD, Inpainting)

The quantized Turbo model includes the quantized Qwen3 encoder as a
dependency for automatic installation.

@Pfannkuchensack

Add higher quality Q8_0 quantization option for Z-Image Turbo (~6.6GB)
to complement existing Q4_K variant, providing better quality for users
with more VRAM.

Add dedicated Z-Image ControlNet Tile model (~6.7GB) for upscaling and
detail enhancement workflows.

@blessedcoolant

blessedcoolant