Down on the Point the lanes are narrow, the curbs are granite and half the front doors open straight onto the sidewalk, so snow here is a close-quarters problem. AML Construction, LLC clears it — plowing, shoveling walks and entries, moving banks back where there is nowhere left to push, and salting the shaded stretches that never catch the January sun. Around Washington Square a storm means starting long before the city stirs, working the tight spots by hand where a blade would do damage. By the time the light comes up gray over the harbor the brick walks are passable and the doorways are open. Old streets, careful work, a town that keeps moving.