Cross project information

I am looking for some good practices on cross project information. We have several repositories, that together compose a bigger "platform". So I what I am looking for is sharing cross repo information, memory is one (like overall spec/ architecture/docs of the platform) but also repository specifics - like this one is backend in golang, yaml config etc, and this one has NextJs dashboard etc. I know I could just have user space [claude.md](http://claude.md) but thing is I also have tens of other projects, repos with things not necessarily linked together if at all - in various tech stacks. I was thinking of some qdrant db exposed as MCP but maybe there is something you can recommend? I know the shared project memory is one use case and cross repo sharing info is another use case. One additional Information Is that I have a team of people working on those repos - not only "me". I would appreciate your help Clauders