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Unit tests for FiniteStrainPlasticity with multiplicative decomposition. Test coverage: - Material construction with validation (E, ν, σ_y, H parameters) - State initialization (F_p, α_bar, κ) - Small strain limit verification - Identity and pure rotation deformation (frame indifference) - Uniaxial extension (elastic and plastic regimes) - Simple shear deformation - Incremental loading with state persistence - Plastic incompressibility constraint (det(F_p) ≈ 1) - Kinematic hardening behavior (backstress evolution) - State persistence across load steps - Type stability verification