depend on the registry instead of DebrisSystem in the AI path

src/lib/ecs/system/AiSystem.h

@@ -20,7 +20,6 @@
 #include "StandbyExecutor.h"
 
 class EntityAdmin;
-class DebrisSystem;
 struct GameConfig;
 
 // Orchestrates ship-behavior decision-making in three batched phases:
@@ -35,7 +34,7 @@ class AiSystem
 public:
     explicit AiSystem(const GameConfig& config);
 
-    void tick(EntityAdmin& admin, const FactoryState& state, const DebrisSystem& debris);
+    void tick(EntityAdmin& admin, const FactoryState& state);
 
 private:
     void selectWinningBehaviors(EntityAdmin& admin);