I found what was missing! Apparently, the Link Binary With Libraries step lost the libauwrapper.a entry somehow. Now it’s building and gets further into the auval test.
(I suspect part of the reason it got lost is because Xcode does NOT like when you have a sub-project open in two different projects, and it disables access to it in the project that is opened second. While trying to compare mine against again, I probably removed and was unable to add it back properly.)
Now it is failing with the Format Tests, saying it cannot initialize the unit for 1-1, 1-2 or 2-2 inputs-outputs.
At least it opens now.