depend on factory data instead of BuildingSystem in the AI path

src/lib/core/BuildingType.cpp

@@ -52,3 +52,18 @@ bool isBeltSubsystemType(BuildingType type)
         || type == BuildingType::TunnelEntry
         || type == BuildingType::TunnelExit;
 }
+
+bool isProductionBuildingType(BuildingType type)
+{
+    switch (type)
+    {
+    case BuildingType::Miner:
+    case BuildingType::Smelter:
+    case BuildingType::Assembler:
+    case BuildingType::ReprocessingPlant:
+    case BuildingType::Shipyard:
+        return true;
+    default:
+        return false;
+    }
+}

src/lib/core/BuildingType.h

@@ -35,6 +35,10 @@ std::string buildingTypeId(BuildingType type);
 // they receive, matching against every recipe of their building type.
 bool isAutoRecipeBuildingType(BuildingType type);
 
+// Buildings that run a production cycle: Miner, Smelter, Assembler, Reprocessing
+// Plant and Shipyard (REQ-UI-DEBUG-OVERLAY counts these).
+bool isProductionBuildingType(BuildingType type);
+
 // Belts, splitters, and tunnel ends keep their runtime data in the belt subsystem
 // rather than in the Building instance, so placing/removing them must register or
 // unregister a tile with BeltSystem.