rea-video: break a hit video into a shot-by-shot plan

@AYi_AInotes describes installing rea-video in Claude Code or Codex: you feed it a local video and get a shot-by-shot production method, prompts with screenshots, and a remake plan, not a finished film. It needs Python 3.10 or later and ffmpeg. Related ideas include video-analysis (aligning a transcript to frames), routing each shot so not every shot uses the most expensive model, and rehearsing at low cost before a final polish.