yibie/caveman-codex ? reverse-engineered prompt

Build me a simple Codex Desktop local plugin called caveman that I can install into one of my projects and then turn on with $caveman.

I want it to make the coding agent talk in a very short, caveman style so it uses way fewer tokens, with modes like lite, full, and ultra, and a way to turn it off with stop caveman or normal mode. Please make the install experience easy, ideally a one command setup that copies the plugin into the project and updates whatever Codex Desktop needs so it shows up in the Plugins UI. If it helps, look up the current Codex Desktop plugin docs online and follow the right local plugin format.

Also include clear README instructions and a simple macOS install script or command for people who cloned the repo locally.