Dimensional Deployment Theory (DDT) within the FDM Framework

We present Dimensional Deployment Theory (DDT), a self-contained field-theoretic framework in which observable 3+1-dimensional spacetime is not a primary structure but the condensed phase of a dynamical 2+1-dimensional substrate (M₃, g₀₁), accessed through a geometrically controlled deployment map D₂ ₃. The framework is built on four pillars: (I) A unique canonical action coupling a scalar deployment field X² non-minimally to the 2+1D curvature, with all field equations derived by explicit variation. (II) A variational derivation of dissipative dynamics from the Keldysh influence functional, yielding emergent dimensional viscosity ₃₈₌ = DDv₂₃² = ^-1 free of independent bath parameters. (III) A constructive existence and stability proof for propagating dimensional fronts X² (r - vD tD) with velocity and width derived entirely from the substrate potential curvature. (IV) A complete, self-contained operational calculus—the canonical implementation pipeline with formally declared axioms, admissibility gates, and a strict protocol—that defines unambiguously what constitutes a valid DDT computation, independently of any classical GR or FLRW machinery. All fundamental constants (₃₃ₓ = 2, F = 2 - 1, RF 1. 0987) are mathematically shielded against continuous reparametrization by algebraic identities and topological constraints. The theory predicts: A universal 9. 87% enhancement of strong-lensing time-delay distances. Spatially correlated H₀ variations at ~5% correlated with the deployment front topology D. An extended high-redshift cosmic timeline (+19% at z = 10). Five strict Popperian falsification criteria—each with a declared numerical threshold and target dataset—are provided. The paper is entirely self-contained: no auxiliary document is required to execute, evaluate, or falsify a DDT prediction.