test: setup common stability and robustness properties tracking

lib/volatility/gkv/Gkv.Quantower.Tests.cs

@@ -301,4 +301,4 @@ public class GkvIndicatorTests
         Assert.True(double.IsFinite(val));
         Assert.True(val < 0.001, "Constant price should produce near-zero volatility");
     }
-}
+}

lib/volatility/gkv/Gkv.Tests.cs

@@ -643,4 +643,4 @@ public class GkvTests
     }
 
     #endregion
-}
+}

lib/volatility/gkv/Gkv.Validation.Tests.cs

@@ -625,4 +625,4 @@ public class GkvValidationTests
         double mean = values.Average();
         return values.Average(v => Math.Pow(v - mean, 2));
     }
-}
+}