Add MITC4 drilling diagnostics output and comparison contract

tests/reference/mitc4_reference_comparison.h

@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "fesa/core/status.h"
+#include "mitc4_drilling_report.h"
 
 namespace fesa::test {
 
@@ -77,6 +78,7 @@ struct Mitc4ComparisonReport {
   std::vector<Mitc4Warning> warnings;
   std::size_t worst_row;
   bool passed;
+  std::optional<Mitc4DrillingDiagnosticsReport> drilling_diagnostics;
 };
 
 class Mitc4ReferenceComparison {