Three Years of High-contrast Imaging of the PDS 70 b and c Exoplanets at H? with MagAO-X: Evidence of Strong Protoplanet H? Variability and Circumplanetary Dust - Close, Laird M; Males, Jared R; Li, Jialin; Haffert, Sebastiaan Y; Long, Joseph D; Hedglen, Alexander D; Weinberger, Alycia J; Follette, Katherine B; Apai, Daniel; Doyon, Rene; Foster, Warren; Gasho, Victor; et al. (ASTRONOMICAL JOURNAL, 2025)