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New file: test/domains/continuum/test_validation_hex8.jl Tests for: - Hex8 element stiffness matrix - Comparison against reference solution - Validates assembly with hexahedral elements Validation: - Creates single Hex8 cube element - Assembles element stiffness matrix - Compares against analytical or reference FEM solution - Checks matrix symmetry and positive definiteness Ensures assembly works correctly for element types beyond Tet4, validating generality of the cache architecture.