refactor AI system

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

@@ -0,0 +1,12 @@
+#pragma once
+
+class EntityAdmin;
+
+// When Repair wins, moves the ship toward its target and assigns that target to
+// each repair tool that has it in range. RepairSystem applies the healing and
+// does fallback acquisition for tools whose preferred target is out of range.
+class RepairExecutor
+{
+public:
+    void execute(EntityAdmin& admin);
+};