While pulling back on the toggle with my right hand, I gently depressed the tiny black tab underneath the highly visible retracting-nickel-triangle thing, using a straightened paper clip in my left hand. I was able to slowly release the toggle at that point.
The problem is not totally fixed, though -- the bolt won't hold open when a magazine is inserted. The piece of the mag that serves as a follower is the chintzy little knurled knob that you can use to depress the magazine spring. Instead of pushing straight up on the hold open spring, it kind of pushes its way around the side of the spring and gets stuck there. I can see it doing this if I put an empty mag in the disassembled frame.
It's also possible that I messed up the spring while trying to make it lay flat... but the whole assembly just doesn't seem to want to work.
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