OS System / ε-Model — Chapter 60: The Operational Structure (OS) Framework Physics as Projection, Relations as Reality

This chapter expands the Operational Structure (OS) framework by introducing physics as a projection layer rather than a fundamental description of reality. The chapter proposes that physical quantities such as space, time, motion, forces, and measurable constants are emergent projections of deeper relational equilibrium structures. The OS layer itself contains only structural relations and equilibrium conditions, while physical measurements represent observable interpretations of those relations. The work develops the conceptual framework in which: relations are fundamental, geometry emerges from stable relations, matter is a projection of equilibrium, physical measurements describe projected states rather than primary causes, reverse reconstruction allows hidden relational structures to be inferred from observable quantities. The chapter also formalizes the distinction between the OS layer and the projection layer and introduces the role of structural invariants as the bridge between relational structure and measurable physics. This publication represents an original research record documenting the current development stage of the Operational Structure framework.