feat(solver-bootstrap): step 3 — core-ids-and-diagnostics

include/fesa/core/source_location.hpp

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <cstddef>
+#include <filesystem>
+
+namespace fesa {
+
+struct SourceLocation final {
+    std::filesystem::path file;
+    std::size_t line;
+    std::size_t column;
+};
+
+}  // namespace fesa