This report presents a comprehensive theoretical and engineering specification for the Unified Field Scalar-Hydraulic Drive, a propulsion architecture that signifies the paradigmatic shift from kinetic Newtonian reaction systems to tactical, distributed metric engineering. Grounded in the framework of Refractive Vacuum Gravity (RVG), this analysis posits that the physical vacuum behaves not as an empty void but as a refractive medium with a variable index (K), modulated by a scalar field coupled to the trace anomaly of the energy-momentum tensor. We identify the persistent 95.4 GeV di-photon resonance-observed in LHC Run 2 data by the CMS and ATLAS collaborations with a combined local significance of 3.1σ [2]-as the fundamental Dilaton/Radion mediator governing this interaction. The propulsion mechanism exploits high-intensity magnetic gradients (∇B 2) generated within a recursive Magnetic Amplification and Direction Assembly (MADA) to pump this scalar field, locally increasing the refractive index (K > 1) and creating a "Metric Bubble" or "Metric Envelope." This envelope facilitates hypersonic transport (Mach 26+) independent of conventional aerodynamic constraints by mitigating plasma sheath formation and thermal loading. This document details the transition from active electromagnetic vectoring to "passive" scalar hydraulics, utilizing Distributed Mechanical Gimballing and Variable Flux Shunting to manage the permanent "virtual pressure" (203-540 Tesla) generated by the core. We provide a rigorous derivation of the "Master Equation of Levitation," a technical assessment of laminated flux trapping (0.15-0.35 mm waveguides) utilizing metastable iron-nitride (α ′′-Fe16N2) alloys [7], and an analysis of the system's operation within the context of the Running Vacuum Model (RVM) [3] and the Metric Stiffness Recovery Rate (τ relax). By linking the drive's mechanics to the resolution of the cosmological S8 tension and the operational necessity of Entrainment Symmetry, we establish a unified pathway between high-energy particle physics, cosmology, and advanced aerospace engineering [6].