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JuliaFEM.jl/test
Jukka Aho d47eed8ed3 test: Add finite strain plasticity material model validation
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
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