We propose a fully local realist unified physical framework derived entirely from a single minimal underlying rule: space is filled with discrete ground-state field quanta, whose sole dynamical property is nearest-neighbor attraction proportional to the product of their excitation levels, with strictly conserved total excitation across all space. This rule is not an ad hoc postulate, but a distillation of a universal physical tendency observed across all scales—spontaneous attraction between adjacent entities, structurally isomorphic to van der Waals forces, nuclear binding, the Casimir effect, and Bose–Einstein condensation. From this single rule, we derive the following core consequences forward, with no reverse-engineering: Excitations spontaneously form stable self-bound topological structures with a “hard core + extended ripple” profile, naturally accounting for wave-particle duality without separate postulates; Newtonian gravity (F∝r2M1M2) emerges directly as the macroscopic sum of all nearest-neighbor attractions, with the inverse-square law following purely from 3D geometry and flux conservation; An all-or-nothing threshold mechanism for quantum measurement, explaining the photoelectric effect and Born rule without wavefunction collapse; A paradox-free local realist account of double-slit interference, quantum erasure, and delayed-choice experiments; Gravitational time dilation, motion time dilation, and Lorentz invariance as emergent phenomena, with no additional assumptions about spacetime structure. This framework is fully compatible with all existing experimental observations of standard quantum mechanics and general relativity, while making three falsifiable, qualitatively distinct predictions. The central prediction—a sharp threshold step in interference visibility versus path-marking coupling—is testable with existing quantum optics equipment. We do not claim to replace established theories, but offer a minimal, self-consistent, falsifiable alternative local realist picture.