6 months out and my rotator cuff injury is definitely improving. But still not completely fixed. After much nonsense with my primary care doc I'm going to a physical therapy center. I have integrated some dumbell bench presses and curls into my routine, with no ill effect. Overhead reaching is noticeably less painful in the "sticking spot", but I'm not foolish enough to start doing any kind of overhead exercises.
I could see this easily taking a year to heal sufficiently, whatever it is, but it's trending in a positive direction.