I started riding the bike again on Sunday, albeit much mess vigorously than usual. I started to ride the Fuji, but had to call it off when I noticed that the wheel was out of true. I rode the 3-speed instead.
I don't think the wheel was jolted out of true by the accident. One of the spokes was broken, and I don't see how it could have been simply be me falling off the bike. It takes a much harder jolt to the wheel to do that. Rather I think I probably broke it earlier, hitting a sinkhole or something on the path, and that the wheel starting to go out of true is what actually caused the accident.
I noticed that the wheel was out of true because it had started hitting one of the brake pads on every revolution. The accident occurred because the brakes caught much faster than expected when I started to slow down for the intersection. If the wheel was hitting the brake pad, or getting near to it as it began to warp, that could explain what happened.
I took the wheel up to Providence Cycle in Warwick, where my bike mechanic now works, and had it back the same day. I do tend to break spokes on the rear wheel, a combination of my weight and my preferred tire pressure that makes the rear wheel, especially, unforgiving of sudden jolts. I need to remember to check the wheel before a ride to make sure I'm not starting off with a broken spoke or two.