Connect MITC4 drilling evidence across analysis procedures

include/fesa/results/result_records.h

@@ -4,9 +4,11 @@
 #include <array>
 #include <cstddef>
 #include <string>
+#include <optional>
 #include <vector>
 
 #include "fesa/core/source_identity.h"
+#include "fesa/elements/mitc4_drilling_mode.h"
 
 namespace fesa {
 
@@ -70,6 +72,15 @@ struct ShellResultRow {
   std::array<ShellSectionStressRow, 3> stress;
 };
 
+/// @brief Separates artificial internal spatial moment from raw equilibrium.
+/// @note The actual immutable kernel mode accompanies every production frame.
+struct Mitc4DrillingEvidence {
+  Mitc4DrillingMode mode;
+  std::array<double, 3> drilling_moment{};
+  // Raw force balance and raw moment balance minus positive internal drilling.
+  std::array<double, 6> equilibrium_with_drilling{};
+};
+
 /// @brief Carries a complete shell result candidate for atomic validation.
 struct ShellStateCandidate {
   std::vector<ShellResultRow> rows;
@@ -79,6 +90,7 @@ struct ShellStateCandidate {
   // [FREE_RESIDUAL_NORMALIZED,FORCE_BALANCE_NORMALIZED,
   //  MOMENT_BALANCE_NORMALIZED].
   std::array<double, 3> verification_metrics{};
+  std::optional<Mitc4DrillingEvidence> mitc4_drilling;
 };
 
 }  // namespace fesa