The standard cosmological model (ΛCDM) and the Standard Model of particle physics face escalating phenomenological crises, defined by the persistent non-detection of weakly interacting massive particles (WIMPs) and severe observational discrepancies such as the 𝐻0 and 𝑆8 tensions. This paper introduces "The Geometric Thaw," a unified foundational framework that re-ontologizes the vacuum of space from a static, inert manifold into a dynamic, macroscopic quantum superfluid. Utilizing the Tisza-Landau two-fluid model and the Gross Pitaevskii equation, we demonstrate that the phenomena currently attributed to the "Dark Sector" are the emergent mechanical and thermodynamic properties of a phase-transitioning acoustic metric. Dark Matter is mathematically redefined as the restorative geometric stiffness and topological tension of quantized vortex lattices generated by baryonic rotation, yielding an asymptotic 1/𝑅 force that naturally flattens galactic rotation curves. Dark Energy and the 𝑆8 structural smoothing are derived as synchronous thermodynamic backreactions; the continuous injection of stellar thermal exhaust (𝐸 = 𝑚𝑐2) locally "melts" the pristine superfluid vacuum into a highly viscous normal fluid, driving accelerating volume expansion and introducing emergent shear viscosity. Finally, this framework provides a mechanical resolution to the quantum measurement problem via thermodynamic decoherence, transitioning foundational physics from statistical probability to thermodynamic determinism.