cadence 是做什么的？
Author, edit, preview, and render programmatic videos with Cadence — Lua + LÖVE2D, browser-free alternative to Remotion/HyperFrames. A composition is a pure-Lua file; cadence render comps/foo.lua -o out.mp4 produces the video. Load when creating, editing, animating, debugging, or rendering motion graphics, captions, title cards, or vertical shorts with Cadence/ellua Lua comps. Covers the comp API, CLI (render, verify, lint, check), determinism rules, and the mandatory verification loop.