This is pretty awesome! For our critical code/data literacy curriculum we usually introduce non coders to how hypertext has changed reading, with Hypothesis, and writing, with HedgeDoc and TW. And then tool that bridge such ecosystems is Pharo/GT. TiddlyWikiPharo has some messages (utilities) that allow to convert a HedgeDoc url to a Markdown tiddler. But having the possibility to edit a wiki in a collective way would provide the realtime multiuser experience of HedgeDoc Markdown with power of TiddlyWiki and WikiText. I missed this post, but I would like for sure attend to another demo.
Keep the good work.