Huh. I
thought I did a pretty thorough job finding versions when I originally back-populated the history for that git repo, but I just remembered one place that apparently I didn't think to check back then: my ancient external Time Machine drive!
I found in literally
the oldest backup state I had a copy of my then-current resource pack dated… 2011-09-11.
I'll dig around for other versions throughout my Time Machine backups (now that I know to check them) and upload something tomorrow. Maybe I'll even rewrite that git repo history to inject some old copies there…