The observed dark-energy scale corresponds to a dimensionless vacuum-energy ratio of order 10^-122 in Planck units. In standard effective-field-theory reasoning, this is known as the "vacuum catastrophe": the natural UV expectation is O (1), yet the Universe selects an extreme IR suppression. Building on the closed two-threshold normal form isolated in the companion work (Mittermeier RG Attractor, 2026), we identify an explicit, fully analytic Renormalization Group (RG) mechanism in which this hierarchy emerges as a dynamical output of the flow, rather than a cancellation among huge UV contributions. The central ingredient is a "cosmology anchor" Eₗambda implemented as a single-point constraint log10 (Lambdaₕat) = -122 at a deep-IR flow time ucosmo = 300. We show that the anchor fixes exactly one integration constant (a boundary condition), while all remaining structural coefficients are rigidly locked to closed invariants—the 15/16 UV plateau, the plastic constant rho, and the sqrt (pi) -coupled threshold pair. This yields a parameter-minimal, falsifiable template: the hierarchy is generated dominantly by integrating the universal plateau exponent over a finite RG time, with threshold terms contributing only O (1) shifts. We provide closed-form back-integration, quantitative contribution bookkeeping, and numerical verification via plots, tables, and sensitivity diagnostics that delineate the required stability of the plateau exponent and threshold structure.
Rainer Andreas Mittermeier (Mon,) studied this question.