WestfW
Well, there it is, with what might be about the minimal set of components needed to attach a debugger to see if it works. Applying USB power (remember, there is no actual USB on this chip :-( ) causes the power LED to light up, and didn't release any smoke or cause my Mac to complain about drawing too much power, so that's a good sign.
The QFN soldering (my first time!) went better than I expected. I used the "Maker Paste" low-temp solder from Adafruit, and a hot plate. I guess I used too much paste, because I got solder balls around the outside, but they cleaned up pretty easily, and as much as I can actually see looks really good. (and, it didn't blow up!) https://forums.adafruit.com/viewtopic.php?f=42&t=154682
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