Emergent Cosmological Topology from Reaction-Diffusion-Projection Dynamics: A Structural Account of the Cosmic Web with a Falsifiable Growth-Exponent Prediction

Proposition + Prediction + Conjecture + 3 Open Questions with Pathways. A reaction-diffusion-projection PDE on a 32^3 comoving lattice produces V_0 = 29.97% structure-to-void volume fraction and Euler characteristic chi = -1602 at t=200 without parameter tuning, matching SDSS and IllustrisTNG topology qualitatively. Falsifiable Prediction: structure growth follows V_0(t) = A(t+1)^alpha + B with alpha ~ 1.063, distinguishable from LambdaCDM linear growth at the few-percent level. Conjecture C1: structural resolution of the cosmological constant problem via projection-saturated void entropy. Open Questions with Pathways closed by Papers 3, 5, 8. Inherits from Paper 0 (axioms A3, A4, A5, A6); refactored from Zenodo preprint doi.org/10.5281/zenodo.19391612.