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02e40946ef
New file implementing 3D tetrahedral topology: - Tetrahedron struct with dim=3, 4 corner nodes (3D simplex) - reference_coordinates() at (0,0,0), (1,0,0), (0,1,0), (0,0,1) - edges() returns 6 edges, faces() returns 4 triangular faces - Backward compatibility aliases: Tet4 (linear), Tet10 (quadratic) - Zero-allocation tuple-based design