Field–System Coupling: An Architectural Instrument for AEW Coupling under Finite Horizons

The paper links field-level admissibility constraints to system-level accountable execution and clarifies why boundary conditions, enacted operation, and witness must remain visibly coupled under finite horizons. Within Fractal Onto-Praxis (FOP), an instrument is not a technical device or software tool, but an architectural construct that makes a structural relation explicit enough to be used across later theoretical and operational work. Field–System Coupling functions in this sense as an architectural bridge between Fractal Onto-Praxis (FOP), Admissibility–Execution–Witness (AEW) coupling, and later scale-transition results. The paper does not propose a new algorithm, empirical model, therapeutic method, or control protocol. It provides a public-facing theoretical clarification of the field/system/witness relation required for accountable viability under finite horizons.