test: setup common stability and robustness properties tracking

lib/volatility/ewma/Ewma.Quantower.Tests.cs

@@ -308,4 +308,4 @@ public class EwmaIndicatorTests
         Assert.True(shortIncrease > longIncrease,
             "Shorter period should respond more strongly to shocks");
     }
-}
+}

lib/volatility/ewma/Ewma.Tests.cs

@@ -550,4 +550,4 @@ public class EwmaTests
         Assert.True(double.IsFinite(resultZero.Value));
         Assert.True(resultZero.Value >= 0);
     }
-}
+}

lib/volatility/ewma/Ewma.Validation.Tests.cs

@@ -492,4 +492,4 @@ public class EwmaValidationTests
         Assert.True(shortIncrease > longIncrease,
             "Shorter period should respond more strongly to shocks");
     }
-}
+}