Sometimes in life, I suppose you really can get a second chance. When I returned from the airport this evening after a brief trip, a package was waiting for me on the front porch. Inside: a honest-to-goodness cake from Aperture Laboratories, along with a notice that I've been accepted into their testing program.
I'm so sorry, GLaDOS. For the potato thing, for everything. I should have believed you.
I suppose I'd better fire up the Nvidia Shield and begin testing. Don't tell, but I think I like testing even more than I do cake.