Add MITC4 drilling diagnostics output and comparison contract

tests/reference/mitc4_drilling_reader.h

@@ -0,0 +1,21 @@
+#ifndef FESA_TESTS_REFERENCE_MITC4_DRILLING_READER_H_
+#define FESA_TESTS_REFERENCE_MITC4_DRILLING_READER_H_
+
+#include "mitc4_drilling_report.h"
+#include "io/hdf5/mitc4_drilling_diagnostics.h"
+
+namespace fesa::test {
+
+inline std::optional<Mitc4DrillingDiagnosticsReport> ReadMitc4DrillingReport(hid_t file) {
+  const auto stored = hdf5_internal::ReadDrillingDiagnostics(file);
+  if (!stored) return std::nullopt;
+  Mitc4DrillingDiagnosticsReport result{stored->formulation, stored->version, {}};
+  for (const auto& frame : stored->frames)
+    result.frames.push_back({frame.storage_step, frame.frame_index, frame.raw_equilibrium,
+                             frame.drilling_moment, frame.equilibrium_with_drilling});
+  return result;
+}
+
+}  // namespace fesa::test
+
+#endif  // FESA_TESTS_REFERENCE_MITC4_DRILLING_READER_H_