feat(linear-static-3d-euler-beam): step 23 - hdf5-results-writer

include/fesa/results/results_writer.hpp

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "fesa/analysis/analysis_state.hpp"
+#include "fesa/core/diagnostic.hpp"
+#include "fesa/core/status.hpp"
+#include "fesa/model/domain.hpp"
+
+#include <filesystem>
+#include <vector>
+
+namespace fesa {
+
+// Keeps the solver core independent of the authoritative result-storage backend.
+class ResultsWriter {
+public:
+    virtual ~ResultsWriter() = default;
+
+    virtual Status write(
+        const std::filesystem::path& outputPath,
+        const Domain& domain,
+        const AnalysisState& state,
+        const std::vector<Diagnostic>& diagnostics) = 0;
+};
+
+} // namespace fesa