diffusers

040c7cde - Set scheduler begin index in remaining FlowMatch pipelines to avoid DtoH sync (#14576)

Set scheduler begin index in remaining FlowMatch pipelines to avoid DtoH sync (#14576) Propagate the set_begin_index(0) fix from #11696 to HunyuanVideo, Mochi, Lumina2, AuraFlow, and Chroma text-to-image/video pipelines. Without it, the first scheduler.step() routes through _init_step_index() -> index_for_timestep(), whose nonzero().item() forces a device-to-host sync on the first denoising step. Fixes #14573. Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>