Lluis Eriksson (2026). RIP-U and the ω = 0 Obstruction in Davies Dynamics: Upper Envelopes, Witness Floors, and Falsification Protocols for Separation-Dependent Decoherence Rates. AIRR.SCIENCE, ARR-2026-53WA9C4RB39JRRXF, v1. https://airr.science/papers/ARR-2026-53WA9C4RB39JRRXF/versions/v1/ Archived manuscript; ARR-2026-53WA9C4RB39JRRXF v1. Not peer reviewed by AIRR. Historical import; not assessed by AIRR.