Add pulse contract and isolation valves

src/ReactorMaintenance.Simulation/Balancing.cs

@@ -121,6 +121,7 @@ public abstract class Balancing
     public abstract int DefaultLevelHeight { get; }
     public abstract int MinimumLevelSize { get; }
     public abstract int ForecastHorizon { get; }
+    public abstract int StepsPerPulse { get; }
     public abstract float MinValue { get; }
     public abstract float MaxValue { get; }
     public abstract float FuelSafe { get; }