Inertia has been historically treated as a primitive of mechanics---an irreducible tendency of matter to persist in its state of motion. Energy-Efficiency Theory (EET) provides a first-principles reformulation grounded in the three postulates of the constitutional framework: inertia is the resistance of constrained-state energy to constraint reconfiguration, arising from the fundamental asymmetry between formation and meltdown barriers (Eb^melt Eb^form). This document establishes the master framework for inertia within EET. The constitutional core (Parts I--II) provides the closed ontological definition, the formal stratification into three levels (L1 ontological, L2 dynamical manifestations, L3 extended phenomena), and the mandatory interface specifications to mass, dynamics, and extended systems. The core is closed to modification; all subsequent modules are explicitly open to refinement under declared governance. The framework further provides canonical realizations (Part III), including the mass-energy mapping, Newton's second law as a macroscopic limit, inertial leakage under thermal fluctuations, and the graph-theoretic realization via edge-weight freezing. Boundary conditions, extended manifestations (inertial inheritance and interruption), candidate closure modules, and a full governance table with constitutional guardrails are specified. Three falsifiable predictions with explicit statistical criteria anchor the framework in empirical science. This master specification supersedes all earlier treatments of inertia within EET and provides the authoritative foundation for all derivative works on mass, force, motion, and extended inertial phenomena. Keywords: Inertia; Energy-Efficiency Theory; barrier asymmetry; constrained-state energy; mass; ontological framework
Hongpu Yang (Thu,) studied this question.