Anchoring the Eigengap: Cross-Modal Spectral Stabilization for Sample-Efficient Representation Learning. - Nikhil J. Dhinagar; Vidhi Chhatbar; Chirag Jagad; Pavithra Senthilkumar; Sophia I. Thomopoulos; Mahir H. Khan; Sook-Lei Liew; ENIGMA-OCD Working-Group; Paul M. Thompson (CoRR, 2026)