diffusers

1617ef2d - Remove LM-head grafting; modular block uses a generative text_encoder

Remove LM-head grafting; modular block uses a generative text_encoder Drop `graft_lm_head` and drive the modular `Ideogram4PromptUpsampleStep` off a generative `text_encoder` (`Qwen3VLForConditionalGeneration`), matching the standard pipeline: guard with `can_generate()` and an instructive error, and build the outlines logits processor lazily. Updates the copied `_get_text_encoder_hidden_states` to resolve the decoder for both encoder classes.