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New 328-line test file for FiniteStrainPlasticity material model: - Tests material construction and parameter validation - Tests state management (FiniteStrainPlasticityState with F_p, α_bar, κ) - Tests small strain limit (should recover small-strain plasticity) - Tests identity deformation (F=I gives zero stress) - Tests pure rotation (objectivity, frame-invariance) - Tests uniaxial extension in elastic and plastic regimes - Tests simple shear deformation - Tests incremental loading and plastic incompressibility (det(F_p)=1) - Tests hardening behavior (kinematic hardening via backstress) - Tests state persistence (unloading doesn't decrease plastic strain) - Validates type stability Comprehensive test for geometrically exact plasticity using multiplicative decomposition F = F_e F_p, essential for large deformation analysis.