test: setup common stability and robustness properties tracking

lib/volatility/hv/Hv.Quantower.Tests.cs

@@ -324,4 +324,4 @@ public class HvIndicatorTests
         Assert.True(double.IsFinite(val));
         Assert.True(val > 0, "Varying returns should produce non-zero volatility");
     }
-}
+}

lib/volatility/hv/Hv.Tests.cs

@@ -734,4 +734,4 @@ public class HvTests
     }
 
     #endregion
-}
+}

lib/volatility/hv/Hv.Validation.Tests.cs

@@ -667,4 +667,4 @@ public class HvValidationTests
         double mean = values.Average();
         return values.Average(v => Math.Pow(v - mean, 2));
     }
-}
+}