Rename coolant to water

src/ReactorMaintenance.Simulation/Systems/StructuralIntegritySystem.cs

@@ -35,7 +35,7 @@ internal static class StructuralIntegritySystem
 
         var next = carrier switch {
             ECarrierType.Fuel => level with { Fuel = layer },
-            ECarrierType.Coolant => level with { Coolant = layer },
+            ECarrierType.Water => level with { Water = layer },
             ECarrierType.Electricity => level with { Electricity = layer },
             _ => throw new ArgumentOutOfRangeException(nameof(carrier), carrier, "Unsupported carrier.")
         };