SOURCE 0 : THE FOUR-LAYER ARCHITECTURE

The four categories of the SOURCE 0 Doctrine are not parallel classifications. They constitute a causal sequence — problem domain, methodological response, legal operationalization, normative constraint field — whose coherence depends on the formal articulation of three inter-layer interfaces. This article makes that architecture explicit, disambiguates its shared vocabulary across twelve distinct definitions, establishes the material modification threshold, closes the deliberate misclassification escape route, and maps each layer against its precise regulatory obligations. The four-layer architecture is not a model. It is a condition of proof.