[throwaway81523]

I don't understand all those features you're asking for, but maybe some adaptation of https://fossil-scm.org ? It's a wiki, blog, DVCS, and bug tracker all in one program, using sqlite as a backing store. An instance of it runs in about around 2MB of memory on a small vps.

[dang-guefever]

Hint: https://www.youtube.com/watch?v=tc4ROCJYbm0

[throwaway81523]

That's an old video promoting Unix, so I don't see what you're getting at. Unix is not a distributed OS. The web has to work over communications channels with fairly high latency, so you don't want a file-system-like interface either. If you have something specific in mind, maybe you could say what it is instead of being coy.