The Universal Entropic Mass Principle - Entropy, Energy Efficiency, and the Entropic Content of Mass

We present a unified entropic framework in which both physical processes and stable physical states are constrained by a minimum entropic cost. The theory is explicitly anchored to the canonical formulation of the Universal Entropic Mass Principle (UEMP), which postulates that the existence of mass implies a minimum associated entropy content. We show that this postulate admits two complementary manifestations: an operational regime, in which entropy selects energetic efficiency in irreversible transformations, and a structural regime, in which mass corresponds to entropy incorporated into stabilized degrees of freedom. Aggregated experimental results from classical and quantum information-erasure experiments are shown to be consistent with the operational bound within reported uncertainties. The present work does not introduce additional hypotheses, but clarifies the logical structure, operational meaning, and experimental falsifiability of the UEMP.