SDXL UNet is larger than the practical ONNX protobuf single-file limit, so it is
published as unet.onnx plus one companion unet.onnx.data file. It is not
published as hundreds of initializer shard files.
Tokenizer files and scheduler config are saved beside this folder:
The runner uses the two SDXL text encoders, performs classifier-free guidance,
feeds text_embeds and time_ids into the UNet, then decodes latents through
the ONNX VAE decoder.