Hah!
One of the alignment writeups referred to worn strut mounts.
I took the strut mount assys apart yesterday, and found that so. The nuts had also come loose at some point and had been replaced with regular nuts. I vaguely remember a clunk out of the passengr front at some point several years ago also, so I may have found the primary reason for the tire wear pattern.
Ordered a
set of these.
At some point soon, I'll add up the cost of all these parts and the alignment. Do I really want to know?