Hello,
This repository was suggested to me by github and I just read the readme.
Looking at your research oriented list of mesh libraries, I wanted to suggest you CGOGN_2 and CGoGN_3 as "unified data structure for multiple dimension handling".
In fact, these libraries implement a mesh data structure (based on a theoretical model) that can handle 0D, 1D, 2D and 3D oriented open or closed manifolds whatever their discretization (polygons or polyhedrons). There is also a cgal package based on the same theoretical data model that can handle nD objects. A while ago we made some benchmarks also.