Did I fry my hubs?

Found this.

View attachment 1715838882

I think your hubs are ok.

I would not wory about swedging drums on to the hubs. All drum brakes I have worked on were not swedged or tacked on (tack weld I would not do as that does change metelergy locally and could start a stress point.)

I know the drums are cast iron, but are the hubs? Good point on the tack welding. I'll skip that.