refactor AI system

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

@@ -0,0 +1,10 @@
+#pragma once
+
+class EntityAdmin;
+
+// Moves a ship to its retreat point (the rally point) when Retreat wins.
+class RetreatExecutor
+{
+public:
+    void execute(EntityAdmin& admin);
+};