That scat doesn't look like raccoon to me, I don't know what armadilloes "do" but it sort of looks like possum. So I'd think it might be either possum or armadillo?
I have had similar trouble only with my hens getting in beds and scratching out plants. I've found one sure fire way to stop this: CHICKEN WIRE...laid flat on the ground. If you use old wire, that's already started to rust, it vanishes as soon as you lay it down and toss some mulch over it. Even new wire will "mellow" within a few months and you wont' see. Just lay it down while the plants are dormant and peg it to the ground. I usually use bent wire pieces to hold it down, then weight down here and there with small rocks. the plants grow up through it without any problems. The only thing is you need to keep after weeds so they don't get too big to pull through the wire mesh...that shouldn't be a problem for you, Seedfork, because I know you're a good gardener/weeder (unlike me!).
Sometimes you can't fight whatever nature throws at you, you just have to outsmart it.
