Similar things/self-hosted offerings of interest:
I want to add https://github.com/mozsearch/mozsearch which is trying to replace DXR. It’s already live at searchfox.org
I wonder if they heard of the annotation code feature of sourcehut prior to/while implementing this feature.
They’re unrelated; semantic has been in development for more than 4 years, and codenav has been a planned use for a long portion of that.