Hello again,
I’ve corrected my issue and wanted to share the results.
I downloaded the latest bits for WordPress and Jetpack and did a diff against my site. I found that Jetpack was missing a mess of files from its _inc directory. The lib and scss directories were both absent as well as 25 files from the root of the _inc directory.
After uploading the missing files I was able to get to my admin pages where I was greeted with the message:
“An automated WordPress update has failed to complete! Please notify the site administrator.” (I have separate author and admin accounts for myself)
I realize correlation does not imply causation, so it may or may not have been an automated update that busted the Jetpack plugin. I did find a jetpack7.tmp directory in the upgrade folder that contains files which match the files I found to be missing.
Cheers,
Reeves