refactor: extract core domain dof modules

include/fesa/Core/AnalysisState.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "fesa/Core/Types.hpp"
+
+#include <vector>
+
+namespace fesa {
+
+struct AnalysisState {
+  std::vector<Real> u_full;
+  std::vector<Real> f_external_full;
+  std::vector<Real> f_internal_full;
+  std::vector<Real> reaction_full;
+  bool converged = false;
+};
+
+}  // namespace fesa