Working on state for location

src/CharacterState.h

@@ -5,6 +5,7 @@
 #include <functional>
 #include <Eigen/Core>
 #include <Eigen/Geometry>
+#include "external/nlohmann/json.hpp"
 
 namespace ZL {
 
@@ -124,6 +125,10 @@ public:
     void                   stopInPlace();
     float                  getHp()                      const { return hp; }
     void                   setHp(float newHp);
+
+    // --- Serialisation (runtime mutable fields only; creation info is reloaded from config) ---
+    void save(nlohmann::json& out) const;
+    void load(const nlohmann::json& in);
 };
 
 } // namespace ZL