/layers-conceptual-model Assumes has been loaded. This skill is a library of techniques, not a script — see "How to use these skills" there. The conceptual model is the most neglected load-bearing layer. It defines the objects the product recognises, how they relate, what states they can be in, and the vocabulary for all of it — a deliberate decision about how the product models its domain, independent of any interface. It is not the users' messy mental model (that's the domain layer), and not a database schema, wireframe, or flow. But the gap between this model and what engineers build matte…