Because the Calibre ebook library software just acquired AI garbage (as of 8.16.2, this week), it has *already* been forked. For AI-free Calibre, seek out clbre:

GitHub
GitHub - grimthorpe/clbre: A fork of Calibre called Clbre, because the AI is stripped out.
A fork of Calibre called Clbre, because the AI is stripped out. - grimthorpe/clbre

