Pre-flight Checks
The deterministic validators that stand between a page and the air.
Four checks, three levels, one gate.
Four reports run over a page: wiring, structure, unit and scene. Each issue carries a level — failure, warning or info. A failure blocks go-live and blocks an agent from writing; warnings and info are advisory.
They run on the go-live gate, on agent writes, when a control panel is built, and on demand over HTTP so they can be wired into CI.