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I’m really unsure how this happened, but this is why the aformentioned chain link is stuck. It seems that the very end of one of the steel inner plates had some metal torn away from it, and this metal was then pushed between it and a roller, wedging the roller and link in place.
As this is the very end of a plate, it couldn’t have happened from hitting something. I can only figure that either a manufacturing defect which left a bit of metal flashing sticking out was finally hammered down into place, or maybe a rock or piece of metal or something got on one of the teeth and during a sudden/hard pedal stroke it cut the plate. While the cassette is steel and may have been strong enough to do this, the chainrings are aluminum and likely couldn’t make this happen. I’ve also looked over all of the teeth and they all appear to be in good shape without any exceptional burrs or dented spots.
Later tonight after eating dinner I’ll try to get the bit of metal out, in hopes of salvaging the chain. If this doesn’t work I imagine that tomorrow will also include a quick run to REI for a new chain.
UPDATE: Removing the offending link and dropping in a spare (which I’d forgotten that I had) seems to have sorted it all out.