Hi,
tiddlywiki is a framework, similar to angular.js, but with a different focus and its own very specific expectations. angular is made and optimised for developers to create client / server apps. Tiddlywiki is made for users, as a single page client side app, with no server needed. ... So you will face a lot of conflicting problems. eg: TW redraws the DOM at any given time. The same is true for angular. .. They don't know about each other. I doubt, it will be simple, if not impossible, to let them play nice together.
TW has one major expectation. .... Everything is a tiddler! That means, that if you change the tiddler store, TW refresh functions will redraw the dom, if it is effected.
IMO you should use a mind map library, that is free of a framework dependency. ... Do you know
tiddlymap.org (The link needs several seconds to load. There is no splash screen yet :)
just my 2 cents.
have fun!
mario