Lluis Eriksson (2026). The Weight That Could Not Break It: Machine-Checked Endpoint Reflection Positivity for the Coupled Z_2 Slice. AIRR.SCIENCE, ARR-2026-02YRWX53DG9M3R0R, v1. https://airr.science/papers/ARR-2026-02YRWX53DG9M3R0R/versions/v1/ Archived manuscript; ARR-2026-02YRWX53DG9M3R0R v1. Not peer reviewed by AIRR. Historical import; not assessed by AIRR.