feat(linear-static-3d-euler-beam): step 7 - cmake-test-foundation

include/fesa/build_info.hpp

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <string_view>
+
+namespace fesa {
+
+// Returns the stable solver version written to externally visible result metadata.
+std::string_view solverVersion() noexcept;
+
+} // namespace fesa