Rename coolant to water

src/ReactorMaintenance.Simulation/Models/SurfaceState.cs

@@ -3,10 +3,10 @@
 public sealed record SurfaceState
 {
     public float Fuel { get; init; }
-    public float Coolant { get; init; }
+    public float Water { get; init; }
     public float Electricity { get; init; }
     public float Heat { get; init; }
     public int FuelBlockTurns { get; init; }
-    public int CoolantBlockTurns { get; init; }
+    public int WaterBlockTurns { get; init; }
     public int ElectricityBlockTurns { get; init; }
 }