STT — Minimal Prediction of Lensing Potential Slip

This work derives the first minimal observational prediction of Selector-Time Theory (STT) under a fixed parameter-count assumption. Without modifying Einstein’s bulk equations, STT introduces a dynamic boundary term that restricts the admissible set of global cosmological trajectories. In the linear perturbative regime, this restriction manifests as a small but potentially measurable residual difference between the metric potentials Φ and Ψ, leading to an effective lensing potential slip. The manuscript defines explicit observational diagnostics, estimates the expected order of magnitude of the effect, and formulates a clear falsifiability condition in terms of deviations in weak-lensing and CMB-lensing observables, while preserving the same reference parameter counting as ΛCDM. This document is intentionally concise and operational: it translates the canonical STT total-action formalism into a reproducible observational test contract.