twitch-chat-overlay-skill 是做什么的？
Generate a fake Twitch-style chat overlay video from a transcript or video description. Output is a transparent MOV (QuickTime Animation, true alpha) — chat messages only, no background, no UI chrome — ready to drop as a layer in CapCut, Descript, Premiere, or DaVinci with no blend mode needed. Use when someone wants to add a fake live stream chat to a video they're editing. Triggers on "twitch chat overlay", "fake stream chat", "chat overlay for my video", "make it look like a stream", "add twi