Quantum Mechanics and Special Relativity from 5D Geometry

Derives special relativity and the Schr\"odinger equation from 5D geometry, with mass identified as W-momentum ($m=\hbar k_W/c$). The speed limit $c$ emerges from 5D null geodesics; time dilation is interpreted via reduced W-oscillation as 3-velocity increases. Cross-references Paper 6 for mass-spectrum geometry, and Paper 8 for the separate “quantum mechanics as fiber projection” lane.For a series overview, reading order, and claim‑hygiene guide, see Coherent Gravity Theory (CGT): An Onboarding Primer: https://doi.org/10.5281/zenodo.18212967