Propagation at π/2: Geometric Emergence of Light Speed Determined by a Minimal-Action Principle

We present a geometric formulation in which physical trajectories arise from a single minimal-action principle applied to a real functional Σ constructed from a complex projection structure.Without assuming an invariant propagation speed, we show that null propagation and theuniversality of light speed emerge as consequences of geometric inclination. The frameworksuggests that mass and null motion correspond to distinct regimes within a unified projectiongeometry.