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0da154a1 - Use an Ideogram4PromptEnhancerHead component for prompt upsampling

Use an Ideogram4PromptEnhancerHead component for prompt upsampling Add `Ideogram4PromptEnhancerHead`, a small `ModelMixin` holding the Qwen3-VL LM head, as an optional `prompt_enhancer_head` pipeline component. Upsampling loads the head via a normal `from_pretrained` (its own repo, or bundled later) instead of an in-pipeline download, and grafts it onto the shared head-less `text_encoder` body so no second 8B body is loaded. Both the standard and modular pipelines build the generative model from `text_encoder` + the head; `upsample_prompt` raises an instructive error when the head component is absent.