GR-Razor Stress Tests-Pillar 10: Cosmological Pangaea: Resolution of the Hubble Tension and Capstone Assessment of the GR-Razor Series

Abstract GR-Razor Stress Tests, Pillar 10: The Verdict — A Capstone Assessment of What Was Established, What Was Destroyed, and What the Standard Model Cannot Explain The GR-Razor Stress Tests series is a ten-Pillar independent program of systematic cosmological falsification completed on February 23, 2026. This capstone documents what the series established by calculation, what it demolished by quantitative verdict, and where the program stands at its current boundary. The demolition program is complete and decisive. Pillars 1 through 4 eliminated every principal GR-internal linear mechanism proposed to resolve cosmological tensions. Relativistic peculiar velocity corrections fail by a factor of 100 to 1000 in amplitude. Inhomogeneous backreaction produces at most 1 to 2 percent of the required effect. Vector and tensor mode contributions are orders of magnitude below threshold. Frame-dragging corrections reach 10⁻⁶ to 10⁻⁸ of what is needed. None of them work. Pillar 5 then audited ΛCDM itself and found it broken at its foundations. The Hubble tension stands at 5σ with no internal resolution. The cosmological constant requires fine-tuning to 10¹²² orders of magnitude. Ninety-five percent of the energy budget of the Universe carries no confirmed physical identification. These are not anomalies awaiting explanation. They are failures of the standard model documented on the permanent scientific record with DOIs. The constructive program introduced Cosmological Pangaea: a GR-internal, singularity-free framework proposing a finite structured initial state that underwent fragmentation and expansion. No new fields. No new particles. No modifications to GR. The framework passes two guillotine tests. The primordial spectral index n_s = 0.9650 is reproduced at zero sigma deviation at the physically derived fragmentation epoch density. The horizon problem is dissolved by geometry: the Pangaea object is 1.85 × 10⁴¹ times smaller than its own causal horizon, making CMB uniformity geometrically inevitable without inflation. The inflaton field loses its primary motivation. Two guillotine tests remain open: the CMB acoustic peak test requires Boltzmann code integration with Pangaea initial conditions, and the Hubble tension resolution requires a physical derivation of the triggering mechanism parameters from first principles rather than from the desired result. Both are defined, tractable, and ready for the next phase. The series pauses at the boundary of what this computational environment can establish. The demolition is complete. The construction has two confirmed results and two open tests. The next person who picks this up knows exactly where to start.