Extract

The layers themselves belong to other skills. programming-layers holds the progression, semantic-vocabulary holds layer 2, operational-model holds layer 4, and OM-1 holds the normative statement of all of it. Read them for what each rung produces.

This skill is the discipline a run is held to: how deep to go, what every artifact owes its parent, and what stops the run.

Name the ceiling before the first rung

Ask how far down this goes, and do not go further.

The default ceiling is layer 4, the operational model. It is the last rung where a human decides; everything below is projection, and projecting is cheap to redo and expensive to redo wrongly on a model nobody confirmed.