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b9534e2c55
New 560-line test file for modal analysis NEW API (test-driven development): - Visionary tests for ModalSolver and EigenvalueProblem - Tests single Tet4 element modal analysis - Tests with and without geometric stiffness - Tests heat transfer modal analysis - Extensive documentation of intended API design - Tests currently skipped (@test_skip) until implementation complete - Documents eigenvalue problem K φ = λ M φ - Documents mass matrix assembly and mode shape normalization This test file serves as both test suite and API design documentation for the new modal analysis solver interface.