refactor AI system

src/lib/ecs/system/ai/SalvageScrapEvaluator.h

@@ -0,0 +1,13 @@
+#pragma once
+
+class EntityAdmin;
+class ScrapSystem;
+
+// When cargo is not full, finds the nearest scrap within sensor range and sets
+// it as the target, scoring high. Scores inactive when cargo is full or no scrap
+// is in range (Advance then handles roaming).
+class SalvageScrapEvaluator
+{
+public:
+    void evaluate(EntityAdmin& admin, const ScrapSystem& scraps);
+};