ComfyTV 是做什么的？
Conversation-driven video editing on the ComfyTV canvas — rough cuts, silence removal, pacing passes, montages, trims, concat assemblies, speed changes, color grades, and subtitle burns over footage the user already has. Use when the user explicitly invokes $video-editor or asks to edit footage, cut out dead air or filler, tighten pacing, assemble clips into a sequence, grade a video, or burn subtitles. Reads the video through composite timeline views instead of frame-dumping; always confirms th