Add MITC4 drilling diagnostics output and comparison contract

tests/reference/nonlinear_static_reference_comparison.h

@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "fesa/core/status.h"
+#include "mitc4_drilling_report.h"
 #include "reference_tolerance_policy.h"
 
 namespace fesa::test {
@@ -114,6 +115,7 @@ struct NonlinearReferenceComparisonReport {
   ConstrainedReactionResultantReport constrained_reaction_resultant;
   bool external_blocking_passed;
   bool internal_blocking_passed;
+  std::optional<Mitc4DrillingDiagnosticsReport> drilling_diagnostics;
 };
 
 enum class NonlinearReferenceClassification {