Physics-Aware RIS Codebook Compilation for Near-Field Beam Focusing under Mutual Coupling and Specular Reflections. - Alexandros I. Papadopoulos; Maria Anna Pistela; Dimitrios Tyrovolas; Antonios Lalas; Konstantinos Votis; Sotiris Ioannidis; George K. Karagiannidis; Christos Liaskos (CoRR, 2026)