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4716432d20
New 319-line test file for LinearElastic material model: - Tests material construction and parameter validation - Tests Lamé parameters (λ, μ) computation - Tests stress computation: uniaxial, pure shear, hydrostatic - Tests tangent modulus (4th-order elasticity tensor) - Validates symmetry, isotropy, and physical properties - Tests simplified interface (without state, Δt) - Validates zero-allocation and type stability Comprehensive test for Hooke's law implementation essential for linear static and dynamic analysis.