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Adapted from HunyuanVideo-FoleyTune for the audio-SR workflow: - UniverSR Load Video Audio: extract a video's audio track via ffmpeg (WAV pipe + soundfile, no torchcodec) and carry a UNIVERSR_VIDEO reference forward, with an inline video preview. - UniverSR Video Combiner: mux the enhanced audio back onto the source video without re-encoding video (-c:v copy), trim-aware, with output auto-increment and preview. Both registered alongside the SR nodes; ffmpeg + soundfile required only for these. Adds README docs and an example video workflow. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>