Add ComfyUI single-file checkpoint (generator + text encoder, bf16)

For the ComfyUI nodes at https://github.com/logolabs/agate-comfyui. Same weights as generator.safetensors / text_encoder/ (guide/), stored in bf16 with the config and tokenizer in the safetensors metadata.

comfyui/agate-preview-001.safetensors

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