Building upon the structural foundations established in Papers I–XI of the Unified Field Theory Framework (UFT-F), Paper XII extends the renormalization program to the three-dimensional incompressible Navier-Stokes equations. This work interprets fluid regularity not as an isolated PDE phenomenon, but as the compatibility of fluid evolution with a contractive dissipative master flow. The Navier-Stokes Admissibility Hypotheses are formulated as spectral dissipation floors and $L^1$-integrability constraints, ensuring that energy transfer remains bounded at all scales. Within this framework, singularity formation is recast as an obstruction to hierarchical closure, while global regularity is identified with the fixed-point stability of a universal attractor. By demonstrating that the Anti-Collision Identity (ACI) prevents finite-time blowups through a "hard-deck" dissipation mechanism, Navier-Stokes regularity is reduced to a requirement of Spectral Admissibility within the UFT-F manifold. What is Renormalization in this Context? Renormalization is the mathematical process of filtering infinities and instabilities to extract stable, physically (or geometrically) meaningful quantities. In this series, it is applied to the full UFT-F corpus: the earlier 4,000+ pages of results on particle masses, geometric structures, and closures are re-expressed in standard mathematical language so that their stability and logical soundness can be directly verified by the broader community using conventional tools and nomenclature. Boxing In the Millennium Problems Papers VIII–XVIII represent the categorical audit and standardization phase of the UFT-F program. Rather than claiming standalone unconditional proofs, these papers demonstrate that each Millennium Prize problem (Navier–Stokes regularity, Riemann Hypothesis, P vs NP, Hodge, BSD, Yang–Mills mass gap, and others) reduces functorially to a question of spectral admissibility inside Spectral Figurate Geometry. The problems are rigorously “boxed in” within ordinary mathematical structures: any violation would necessarily break the global spectral stability, L1-integrability, index rigidity, and Redundancy Cliff (chi ≈ 763.55827) already established in Papers I–VII. In short, these conjectures are not arbitrary independent mysteries ... they emerge as structural requirements of the very geometry that permits stable mathematical objects to exist in the first place. In the case of Paper XII, we show that the "blowup" of fluid velocity is prevented by the same spectral floor that stabilizes particle masses. By defining a minimum dissipation scale (the "Hard-Deck"), we have boxed in the fluid equations, proving they must remain smooth and predictable within the UFT-F hierarchy. This series does not replace the core UFT-F results; it makes their consequences legible, auditable, and verifiable in standard mathematical terms.