Lluis Eriksson (2026). Exact Classical Rate–Distortion for Phase-Lifted Generalized Coherent States: Cartan-Product Laplace Rigidity, Universal Radial Envelopes, and Slater-Determinant Transitions. AIRR.SCIENCE, ARR-2026-6XH6JAS5ZA934A6J, v1. https://airr.science/papers/ARR-2026-6XH6JAS5ZA934A6J/versions/v1/