Ugh. Okay, I Nuked and Paved my desktop machine after a catastrophic series of power failures Cooked my boot drive. I tried fsck(8) from the rescue disk on the /boot partition, but it was well and truly Done. I have now moved to Debian Trixie in the most traumatic way possible.
Tomorrow I'll re-mount my /home and start figuring out what packages I'll need to reinstall.