Fix simcoon tangent conversion; add NEOHC example#48
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Update StressEquilibrium to correctly handle simcoon's hyperelastic UMAT tangent (box/Kirchhoff form) for updated- and total-Lagrangian formulations: avoid symmetrizing the UL spatial tangent when coming from F, convert the returned "box" tangent to the appropriate Ds/dE or spatial Cauchy rate (including J correction for the logarithmic rate), and normalize conversion tag names. Bump simcoon requirement to >=1.14 in pyproject.toml. Add a regression test (tests/test_neohookean_cantilever.py) that exercises simple shear and a large-deflection cantilever to ensure the consistent tangent and UL/TL agreement, and include example and mesh files (examples/03-advanced/neohookean_cantilever.py and util/meshes/cyl08_hexa_*.inp).
Add .claude/ to .gitignore to prevent committing Claude-related artifacts. Update environment_doc.yml to require simcoon>=1.14 (previously >=1.11.0) to use newer fixes/compatibility improvements.
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Update StressEquilibrium to correctly handle simcoon's hyperelastic UMAT tangent (box/Kirchhoff form) for updated- and total-Lagrangian formulations: avoid symmetrizing the UL spatial tangent when coming from F, convert the returned "box" tangent to the appropriate Ds/dE or spatial Cauchy rate (including J correction for the logarithmic rate), and normalize conversion tag names. Bump simcoon requirement to >=1.14 in pyproject.toml. Add a regression test (tests/test_neohookean_cantilever.py) that exercises simple shear and a large-deflection cantilever to ensure the consistent tangent and UL/TL agreement, and include example and mesh files (examples/03-advanced/neohookean_cantilever.py and util/meshes/cyl08_hexa_*.inp).