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bbb44c0cd0
- Define AbstractContinuumTheory abstract type hierarchy - Implement FullThreeD for general 3D continuum mechanics - Implement PlaneStress for thin structures (σ_zz = 0) - Implement PlaneStrain for long structures (ε_zz = 0) - Implement Axisymmetric for rotationally symmetric problems - Add Voigt notation helpers for stress/strain tensors - Document theory assumptions and use cases - 178 lines with comprehensive documentation