Make error code types nodiscard

src/commit_request_parser.hpp

@@ -18,7 +18,7 @@ public:
   /**
    * @brief Status returned by streaming parse operations.
    */
-  enum class ParseStatus {
+  enum class [[nodiscard]] ParseStatus {
     Incomplete, ///< Parser needs more data to complete parsing
     Complete,   ///< Successfully parsed a complete commit request
     Error       ///< Parse error occurred (check get_parse_error() for details)
@@ -27,7 +27,7 @@ public:
   /**
    * @brief Result type for one-shot parsing operations.
    */
-  enum class ParseResult {
+  enum class [[nodiscard]] ParseResult {
     Success,      ///< Parsing completed successfully
     InvalidJson,  ///< Invalid JSON format or structure
     MissingField, ///< Required field missing from input