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Okay, for future people, here's what I've figured out:

To double jump, start a scan at the height of your jump.  Then, whenever you want, hit jump BEFORE ending your scan.  You want to end your scan something like 1 or two frames after you hit jump. You don't actually need to push jump after you end the scan, just before it.  As far as I can tell, you are limited to 1 double jump per jump (i.e. no triple jumps) but idk for sure yet.

i've come to the conclusion that making the double jump is way to finicky so it will remain a demo feature - it won't be possible in the full game. i think it makes speedrunning the game more accessible when it's not dependent on frame-perfect input...

That's fair.  It was pretty cool to figure out, though, even if I never got good enough to triple jump.