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84a1bfec4e
New file src/physics/elasticity.jl: - ElasticityPhysics struct implementing AbstractPhysics interface - Formulations: plane_stress, plane_strain, continuum (3D) - finite_strain flag for Green-Lagrange strain (geometric nonlinearity) - geometric_stiffness flag for buckling analysis - Field storage control: store_fields (converged), store_iteration_fields (debug) - Interface methods: get_unknown_field_name, get_formulation_type, get_unknown_field_dimension - should_store_field() for selective field storage - 205 lines with comprehensive documentation and GPU design notes