✨ LTX-2.4 Prompt Enhancer

Gemma-4 (google/gemma-4-E2B-it) prompt enhancer for LTX-2.4 — expands a short prompt into a detailed audio-visual caption in the model's training-caption style. Add a first-frame image to enhance for image-to-video. Called by the LTX-2.4 video Spaces over gradio_client.