reactor — a ground-truth service with no model ins

reactor answers factual questions about the machine it runs on: is that service alive, who holds that port, which files depend on this one, did that job work. Every answer is measured from the real source the moment you ask. No model inside — everything calling it is already one.

17 composable read-only verbs, over a CLI, MCP, or chat.

Add | why to any run and it reports which stage emptied