I don't know what happened (jeff calls it a phantom injury) but my foot feels pretty good this morning. Let's see what a day of work shoes feels like.
Evening update: my foot still feels fine. I cannot tell you how weird it was to go from crippled gimp on Monday to "it's alright" on Wednesday. There is no reasonable explanation (except perhaps: old age is setting in).
I haven't run since Sunday. I wonder what running feels like. It's been so long. Maybe tomorrow night I'll go out for those three miles I've been putting off.