Manifold-mesh PDE support + extract_surface#202

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lmoresi wants to merge 8 commits into

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feature/surface-submesh

Commits on May 21, 2026

fix(kdtree): return consistent (n,) shape for k=1 query
lmoresi
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feat(cdim): plumb embedded-coord dim through solver / JIT / constitutive stack
lmoresi
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feat(snes_scalar): add petsc_use_constant_nullspace flag
lmoresi
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feat(cdim): mesh navigation + SPHERICAL coord system for dim != cdim
lmoresi
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feat(meshing): add SphericalManifold — gmsh sphere as 2-manifold mesh
lmoresi
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feat(submesh): extract_surface — cd-1 submesh from a parent mesh
lmoresi
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docs(submesh): three-flavour architecture (subdomain, resolution, surface)
lmoresi
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docs(examples): manifold-PDE demonstration suite on SphericalManifold
lmoresi
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