Sundered. I would love to see the equivalent of Rogue Legacy 2 for that game, where the sequel completely supplants the original while expanding upon the storytelling and lore.
As an emacs user, have you considered org mode, with org-roam enabled? You can use source control to back it up or, use something like syncthings to move the files around.
If you hate the taste of scrum give SAFe a try! (but really, please don't)