Why Codex's Plan is Superior:

Their staging plan is excellent from a risk-management perspective. If we were to change both how we fetch vertices and how we calculate which faces touch those vertices at the same time, any resulting bug (like a navigation failure or a broken pipe connection) would be nearly impossible to trace. By forcing the ShapeInterface (Geometry) to be refactored and proven stable first, we guarantee that the vertices are correct before we ever touch the complex adjacency (Topology) math in grid.c.