convenience features (#21)

core/include/ccm/util/SetNoNatural.hpp

@@ -0,0 +1,14 @@
+#pragma once
+
+// Natural (alphanumeric) ordering for collector / set numbers.
+// Digit runs compare as integers so "2" < "10" < "100"; non-digit runs use
+// ordinary string order (e.g. "SWSH001" < "SWSH002").
+
+#include <string_view>
+
+namespace ccm {
+
+// strcmp-style: <0 if a < b, 0 if equal (after natural + lex tie-break), >0 if a > b.
+[[nodiscard]] int compareSetNoNatural(std::string_view a, std::string_view b) noexcept;
+
+}  // namespace ccm