We develop a unified hydrodynamic framework in which the physical vacuum is afinite-resolution coherence sphere of spectral capacity N = 861, governed by the DSM-861geometry (triangular 3-torus, 72-fold symmetry, Heegner anchor D = −163). Inside thecoherence sphere the vorton medium behaves as an incompressible fluid; coarse-grainingbeyond the coherence scale produces compressible cosmological dynamics. Within thisformulation: (1) the quadratic curvature correction of Starobinsky R + R2 gravity is reinterpreted as the bulk-viscous stress tensor of the high-enstrophy vorton fluid, with the Starobinsky mass scale M =√6 × ωrelax; (2) Weinberg asymptotic safety emerges as the continuum renormalization image of finite spectral saturation at N = 861 — the UV fixed point β(g∗) = 0 corresponds to a state in which the admissible mode space is dynamically saturated; (3) modified Friedmann equations are derived in which enstrophy density ρΩ =κΩ drives expansion, replacing a static cosmological constant with a dynamic relaxation term; (4) the fine-structure constant α−1 ≈ 2πN = 2π × 861/(2π) = 861/(2π) ≈ 137.03 arises as the finite phase-closure ratio; and (5) particle identity is associated with winding intersections of a single primordial filament on the coherence sphere. Five observational predictions differentiating this framework from ΛCDM are given, including dynamic w(z), H0 shifts, and high-ℓ CMB structure.