Stern-Gerlach, Double-Slit, and Entanglement as Physical Consequences of a Discrete Elastic Mesh

We propose that three canonical quantum experiments — Stern-Gerlach, double-slit, and entanglement — receive straightforward mechanical explanations from a single physical postulate: fields and matter interact literally with a discrete elastic tetrahedral Mesh that constitutes spacetime at the Planck scale. No observer, no collapse, no spooky action. The Stern-Gerlach splitting emerges from the impedance landscape created by the magnetic field interacting with the FCC lattice symmetry of the Mesh. The double-slit interference pattern disappears when a detector modifies the local impedance, physically blocking one channel. Entanglement decoherence arises from six identifiable sources: environmental noise, metric distance, topological complexity along the line of sight, global curvature, cosmic expansion, and knot lifetime. A falsifiable directional prediction is proposed: entanglement should decay faster along lines of sight traversing WCI-rich regions (galactic filaments) than through cosmic voids. This paper provides the physical picture; the mathematical formalization is developed in the companion work "The Breathing Universe: A Torsional Solid Machine". This work is an extension of "Quantum Mechanics: the Interpretation of Barcelona.