test: setup common stability and robustness properties tracking

lib/volatility/rvi/Rvi.Quantower.Tests.cs

@@ -313,4 +313,4 @@ public class RviIndicatorTests
         // In a neutral market, RVI should be near 50
         Assert.True(val >= 30 && val <= 70, $"Neutral market should produce RVI near 50, got {val}");
     }
-}
+}

lib/volatility/rvi/Rvi.Tests.cs

@@ -668,4 +668,4 @@ public class RviTests
     }
 
     #endregion
-}
+}

lib/volatility/rvi/Rvi.Validation.Tests.cs

@@ -616,4 +616,4 @@ public class RviValidationTests
         return values.Average(v => Math.Pow(v - mean, 2));
     }
 
-}
+}