/layers-intro Load this skill at the start of any design session. It provides the framework context that all other skills depend on. --- The framework Layers of Product Design organises design work into seven layers across three zones. Layers have logical dependency : lower layers are foundations for upper ones. Weak lower layers create UX debt that propagates upward. Reality — complex, contradictory, evolving. Source of all learning. Problem space — knowledge gathered from reality: 1. Observed behaviour — what users actually do 2. The domain — concepts, terminology, and mental models that ex…