Part 3On the Structural Origin of the Speed of Light from Spacetime Resolution

https://youtu.be/HcfKzpBmz0E?si=BrNU9x1fVK7bqOtJ https://youtu.be/iWikxVspcN8?si=IdGqYXMsGBBXyfxd This work investigates the origin of the speed of light from a structural and geometric perspective, rather than treating it as a fundamental postulate or an empirically fixed constant. Starting from a discrete spacetime framework composed of minimal geometric units (JS-SH architecture), spatial and temporal resolutions are defined intrinsically, without assuming continuous spacetime, Lorentz invariance, or electromagnetic wave equations at the foundational level. Within this framework, the speed of light emerges necessarily as the ratio between minimal spatial resolution and minimal temporal update resolution. The central result is not a new numerical prediction for the speed of light, but a clarification of its logical origin. The universality of the speed limit reflects a structural constraint of spacetime itself, rather than a dynamical property of specific fields. This paper complements earlier works in the SRCD series, including derivations of the gravitational inverse-square law and the discrete-to-continuum emergence of the wave equation. While those works focus on mathematical closure and dynamical equations, the present manuscript addresses a deeper foundational question: why a universal maximal propagation speed must exist at all. The work is conceptual and structural in nature, intended for readers interested in the foundations of spacetime, discrete-to-continuum physics, and the logical origin of physical constants. It makes explicit empirical commitments and discusses falsifiability in high-energy or extreme-curvature regimes. No phenomenological tuning or circular definitions are introduced. All quantities are defined structurally, and the relationship to standard formulations is established by exact logical equivalence rather than numerical calibration.