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New file: examples/gmsh_heat_equation/unit_square.geo (32 lines) Defines unit square [0,1]×[0,1] with: - 4 corner points with mesh size lc=0.1 - 4 boundary edges (bottom, right, top, left) - Plane surface for 2D heat equation - Physical groups labeled for boundary conditions - Triangular elements (Tri3, ElementOrder=1) - Frontal-Delaunay meshing algorithm Generate mesh with: gmsh -2 unit_square.geo -o unit_square.msh