Yep, that was it. I booted to recovery mode, went into the NVS editor, fixed the argument, and it's working now. Thanks for all of the help...definitely would have been a lot less of a slog if I'd gotten a different serial adapter much earlier!
For reference, the problem was here:
I (3443) console: Running command autoexec1 = squeezelite -b 500:2000 -d all=info -C 30 -W -n Attic -o I2S 192.168.10.40
This should have been:
I (3443) console: Running command autoexec1 = squeezelite -b 500:2000 -d all=info -C 30 -W -n Attic -o I2S -s 192.168.10.40
For reference, the problem was here:
I (3443) console: Running command autoexec1 = squeezelite -b 500:2000 -d all=info -C 30 -W -n Attic -o I2S 192.168.10.40
This should have been:
I (3443) console: Running command autoexec1 = squeezelite -b 500:2000 -d all=info -C 30 -W -n Attic -o I2S -s 192.168.10.40
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