Retentive Saturation versus Fata Morgana: Integration-Depth Invariance as a Diagnostic for Late-Time Cosmological Structure

A non-violating, parameter-free diagnostic framework for late-time cosmology that distinguishes genuine structural saturation from observational and methodological mirages using integration-depth invariance, falsifiable admissibility criteria, and negative controls, while preserving early-universe consistency and introducing no modifications to standard cosmological dynamics.