Euler-Poincaré Non-Manifold .STL Hole Capper & Self-Intersection Healer

Deterministic Half-edge mesh topology check χ = V - E + F = 2(1 - g), advancing-front minimal-dihedral-energy hole triangulation & BVH self-intersection split engine (.stl, .obj, .3mf, .ply) built for Bambu Studio, PrusaSlicer, Artec 3D, Formlabs — zero-upload ephemeral Wasm RAM execution.