Support importing periodic Netgen meshes#124
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Netgen stores a periodic mesh as an ordinary mesh of the domain plus a list of vertex identifications across the periodic boundaries. Instead of warning that periodic meshes are unsupported, createPETScDMPlex now merges each identified vertex pair (buildPeriodicVertexMap) so the resulting DMPlex is topologically periodic, drops the now-interior seam from the boundary labels, and raises a clear error when the mesh is too coarse and a cell spans a full period. The downstream consumer (Firedrake) attaches the un-wrapped geometry as a discontinuous coordinate field. Adds 2D and 3D periodic conversion tests. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Firedrake PR: firedrakeproject/firedrake#5217