This work presents ψ-Gravity, a covariant gravitational framework in which late-time curvature evolution is governed by a Retentive Divergence Constraint (RDC). The theory preserves full diffeomorphism invariance through effective curvature conservation, while allowing the bare Einstein tensor to acquire a structural correction sourced by the retentive field Δψ and nodes Ξ. ψ-Gravity reproduces the observed fixed growth index γ ≈ 0.64, the structural transition at z† ≈ 1.7, the suppression of the S₈ tension, and the appearance of Mirror Residuals in weak-lensing maps. It remains ghost-free, GR-consistent in early- and high-density limits, and lies outside all known Horndeski/DHOST classes. This article provides the full Lagrangian, covariant derivation of RDC, stability analysis, and falsifiable predictions relevant for Euclid DR1 and Rubin LSST.
Logacheva Yulia (Sat,) studied this question.