Connect MITC4 drilling evidence across analysis procedures

include/fesa/analysis/analysis_state.h

@@ -3,6 +3,7 @@
 
 #include <array>
 #include <cstddef>
+#include <optional>
 #include <vector>
 
 #include "fesa/core/status.h"
@@ -72,6 +73,8 @@ class AnalysisState {
   double PhysicalStrainEnergy() const noexcept;
   /// @brief Returns global force and moment equilibrium components.
   const std::array<double, 6>& Equilibrium() const noexcept;
+  /// @brief Returns actual MITC4 mode and artificial spatial moment evidence.
+  const std::optional<Mitc4DrillingEvidence>& Mitc4Drilling() const noexcept;
   /// @brief Returns normalized shell verification metrics.
   const std::array<double, 3>& VerificationMetrics() const noexcept;
 
@@ -96,6 +99,7 @@ class AnalysisState {
   double physical_strain_energy_{0.0};
   std::array<double, 6> equilibrium_{};
   std::array<double, 3> verification_metrics_{};
+  std::optional<Mitc4DrillingEvidence> mitc4_drilling_;
 };
 
 }  // namespace fesa