feat(nonlinear-static-newton-raphson): step 1 - nonlinear-static-domain-contract

include/fesa/model/domain.h

@@ -74,6 +74,12 @@ class StepDefinition {
   const DomainCollectionView<ConcentratedNodalLoad>& ConcentratedLoads()
       const noexcept;
 
+  /// @brief Returns the approved static procedure identity.
+  StaticProcedureKind ProcedureKind() const noexcept;
+
+  /// @brief Reports whether this step uses the nonlinear static procedure.
+  bool IsNonlinearStatic() const noexcept;
+
   /// @brief Returns the static initial increment provenance value.
   double InitialIncrement() const noexcept;
 
@@ -103,6 +109,8 @@ class StepDefinition {
   std::vector<std::unique_ptr<Load>> loads_;
   LoadView loads_view_;
   DomainCollectionView<ConcentratedNodalLoad> concentrated_loads_view_;
+  StaticProcedureKind procedure_kind_;
+  bool nlgeom_;
   double initial_increment_;
   double time_period_;
   double minimum_increment_;