make repair ships standby with rest of fleet if there is no one to repair (instead of advancing towards the enemy stations)

src/lib/ecs/system/ShipSystem.cpp

@@ -25,6 +25,7 @@
 #include "SalvageScrapBehavior.h"
 #include "SelectedBehaviorComponent.h"
 #include "SensorRangeComponent.h"
+#include "StandbyBehavior.h"
 #include "Tick.h"
 #include "tracing.h"
 #include "WeaponComponent.h"
@@ -401,6 +402,11 @@ entt::entity ShipSystem::spawn(const std::string& schematicId, int level,
         repair.orbitRadius_tiles =
             maxRepairRange * static_cast<float>(m_config.world.orbitFactor);
         m_admin.addComponent<RepairBehavior>(entity, repair);
+
+        // Repair-capable ships hold with the fleet (REQ-SHP-STANDBY) instead of
+        // charging the enemy when no more urgent behavior applies; this applies
+        // whether or not the ship also carries weapons.
+        m_admin.addComponent<StandbyBehavior>(entity, StandbyBehavior{});
     }
 
     return entity;