This work presents the first complete technical formulation of Radial Coherential Dynamics (RCD), a coherence-based theoretical framework in which spacetime geometry, gravity, and cosmological dynamics emerge from the evolution of a single scalar coherence field. The document integrates ontological motivation, mathematical structure, cosmological applications, and falsifiable predictions, serving as a consolidated preprint that precedes later refinements and modular developments presented in subsequent volumes. This work should be read as a technical monograph establishing the core equations, predictions, and scope of RCD, while later books provide methodological closure and detailed derivations.