org-remark VS ov-highlight

I use something similar, called org-remark. By the description of both, they seem to share functionalities. Just mentioning it for visibility :)

org-remark hits some of your requests, but I think lacks the git parts in point 3.

https://github.com/nobiot/org-remark might also work

There is also Org-remark, which lets you highlight and annotate any text file using Org-mode.

Also if you're annotating plain text, org-remark is great. I love not having to use the mouse to select text.

What happens when line number changes? For example https://github.com/nobiot/org-remark handles this changes, but can only anotate org-mode files

Org-Remark, for plain text files perhaps.

you might want to try out org remark

Update: It seems like ov-highlight can do what I want—or it should, anyway, if I can get it to work properly, but that's a me problem (or maybe a doom problem, not exactly sure).

While I am not sure how one would recall marked text later, I recommend taking a look at John Kitchin's ov-highlight https://github.com/jkitchin/ov-highlight