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/component/BehaviorKind.h

@@ -6,6 +6,7 @@ enum class BehaviorKind
 {
     None,
     Advance,
+    Standby,
     Rally,
     Retreat,
     Attack,

src/lib/ecs/component/BehaviorScores.h

@@ -3,12 +3,13 @@
 // Score bands for ship-behavior evaluation. The AiSystem selection pass picks
 // the behavior with the highest score per ship; these constants define a single
 // comparable scale so the desired priority falls out:
-//   Retreat > Attack > Repair / Salvage / Deliver > Rally > Advance.
+//   Retreat > Attack > Repair / Salvage / Deliver > Rally > Standby > Advance.
 // Evaluators may return kInactive when their behavior does not apply this tick.
 namespace BehaviorScores
 {
     constexpr float kInactive = 0.0f;
     constexpr float kAdvance  = 0.05f;  // baseline fallback; always present
+    constexpr float kStandby  = 0.10f;  // repair-capable ships; hold with the fleet
     constexpr float kRally    = 0.20f;
     constexpr float kDeliver  = 0.50f;  // cargo full
     constexpr float kRepair   = 0.55f;

src/lib/ecs/component/CMakeLists.txt

@@ -23,6 +23,7 @@ SET(HDRS
     ${CMAKE_CURRENT_SOURCE_DIR}/SelectedBehaviorComponent.h
     ${CMAKE_CURRENT_SOURCE_DIR}/SensorRangeComponent.h
     ${CMAKE_CURRENT_SOURCE_DIR}/ShipIdentityComponent.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/StandbyBehavior.h
     ${CMAKE_CURRENT_SOURCE_DIR}/StationBodyComponent.h
     ${CMAKE_CURRENT_SOURCE_DIR}/WeaponComponent.h
     PARENT_SCOPE

src/lib/ecs/component/StandbyBehavior.h

@@ -0,0 +1,11 @@
+#pragma once
+
+// Fallback for ships with a repair capability: instead of charging the enemy
+// like AdvanceBehavior, the ship holds with its fleet so damaged allies stay in
+// sensor range and it can heal them. Scored just above Advance and below Rally,
+// so it only wins when no more urgent behavior applies. The executor decides the
+// destination (StandbyExecutor).
+struct StandbyBehavior
+{
+    float score = 0.0f;
+};