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f3f42fd115
New 102-line test file for modal elasticity analysis: - Tests modal analysis of long rod with fixed-fixed boundary conditions - Compares eigenfrequencies with Code Aster results (Tet10 elements) - Validates against analytical solution (fixed-fixed beam) - Tests 5 lowest eigenfrequencies - Uses legacy Element/Problem API Validates modal analysis accuracy by comparing with reference Code Aster results and analytical beam theory.