Z-Image inference gets stuck on Loading transformer
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Description
```
iris.c % ./iris -d zimage-turbo -p "a fish" -o fish.png
MPS: Metal GPU | Apple M4 | 10 cores
Seed: 1771362514
Loading VAE... done (0.0s)
Model: Z-Image-Turbo-6B v1.0 (zimage, 9 steps, guidance 0.0)
Loading Qwen3 encoder... done (1.3s)
Encoding text... done (16.5s)
Loading Z-Image transformer...
```
Hardware 2025 M4 Macbook Air
Model downloaded as-per readme documentation:
`pip install huggingface_hub && python download_model.py zimage-turbo`
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