After some tense moments of failure, I actually decided to read the instructions for how to use the STK600 to program external devices via the ISP pins. Turns out I had to remove a jumper (phew, glad I didn't damage anything). Once I did that, AVR Studio was able to see the AVR on my PCB! I haven't yet worked up the guts to switch the clock source from the internal oscillator to my external crystal since I fear that if the crystal isn't working that I may "brick" the AVR temporarily until I can get a routing card for the STK600 to reset it. Deep breaths...
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