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hao-ai-lab-FastVideo/fastvideo/models
SolitaryThinker 6ca684539c [misc]: simplify cosmos3 port (reuse embed, dedup prompt, hoist)
Behavior-preserving cleanup (95 tests green):
- reuse fastvideo.layers.visual_embedding.timestep_embedding in the DiT
- single-home COSMOS3_VIDEO_NEGATIVE_PROMPT in the lightweight presets
  module; drop the unused duplicate from cosmos3_pipeline
- drop the write-only Cosmos3VisionSpec.clean_latent field + its kwarg
- hoist device = next(transformer.parameters()).device out of the per-pass
  _run closure in cosmos3_get_cfg_velocity
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