Actually, Sqlite-vss has been untouched for quite some time, and the creator has officially communicated that it was deprecated to be replaced by sqlite-vec, which has recently seen its first non-alpha release (v0.1.0). So, I would embrace sqlite-vec now if I were you.

I have not used sqlite-vec much because it was only alpha-released for now, but it finally came out a few days ago. I'm looking into integrating it and use it to make sqlite more my go-to RAG database.