depend on the registry instead of DebrisSystem in the AI path

src/lib/ecs/system/SalvagerSystem.h

@@ -10,7 +10,6 @@
 #include "entt/entity/entity.hpp"
 
 class EntityAdmin;
-class DebrisSystem;
 
 // World-mutation system for salvage modules: each module runs a collection cycle
 // on its own cooldown. When a cycle starts it emits a salvage beam toward an
@@ -22,7 +21,7 @@ class SalvagerSystem
 public:
     explicit SalvagerSystem(EntityAdmin& admin);
 
-    void tick(Tick currentTick, DebrisSystem& debris, FactoryState& state,
+    void tick(Tick currentTick, FactoryState& state,
               std::vector<BeamFiredEvent>& outBeamFiredEvents);
 
 private:
@@ -33,7 +32,7 @@ private:
         Tick         appliesAt;
     };
 
-    void applyPendingCollections(Tick currentTick, DebrisSystem& debris);
+    void applyPendingCollections(Tick currentTick);
 
     EntityAdmin&                   m_admin;
     std::vector<PendingCollection> m_pendingCollections;