also added 'architectural doc'...
This document is a dense knowledge-transfer reference for AI agents or
developers who need to continue work on the "Join Coplanar Surfaces" feature
for Bonsai's SVG drawing generation. It covers the full decision history —
every guard, heuristic, and edge case that was discovered and resolved —
so that a new contributor can understand *why* the code is shaped the way
it is before proposing changes.
Ryan Schultz
42fdfcf318
