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Wan2.2-T2V-A14B-Diffusers-NVFP4

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The TensorRT-LLM command in the Usage section fails on TensorRT-LLM 1.4.0rc0 before the model loads: Error: No such option '--extra_visual_gen_options'.
In 1.4.0rc0, trtllm-serve takes the visual-gen config via --visual_gen_args, and the Wan2.2 config is examples/visual_gen/serve/configs/wan22.yml (wan.yml does not exist there).
Changes:

• Use --visual_gen_args ./examples/visual_gen/serve/configs/wan22.yml
• Note that the command runs from the root of a TensorRT-LLM source checkout, since the config path is relative to it
• Link the TensorRT-LLM visual_gen serving README
  The SGLang command is unchanged. The same fix for nvidia/Wan2.2-T2V-A14B-Diffusers-FP8 is in a separate PR.
  References (TensorRT-LLM v1.4.0rc0):
• --visual_gen_args option: https://github.com/NVIDIA/TensorRT-LLM/blob/cc63e66daf52644f1441e117bb7ba67d20566016/tensorrt_llm/commands/serve.py#L1323
• Serving README: https://github.com/NVIDIA/TensorRT-LLM/blob/cc63e66daf52644f1441e117bb7ba67d20566016/examples/visual_gen/serve/README.md