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Adds POST /render/audio that compiles the composition to discover audio elements, then processes only the audio tracks via processCompositionAudio without capturing any video frames. Returns the mixed audio file path. This eliminates the stitch bottleneck in parallel chunk rendering where the full composition was re-rendered just to extract the audio track (104s → ~5-10s for a typical composition). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>