test: setup common stability and robustness properties tracking

lib/volume/tvi/Tvi.Quantower.Tests.cs

@@ -275,4 +275,4 @@ public class TviIndicatorTests
         Assert.True(double.IsFinite(smallVal));
         Assert.True(double.IsFinite(largeVal));
     }
-}
+}

lib/volume/tvi/Tvi.Tests.cs

@@ -480,4 +480,4 @@ public class TviTests
         // Results should differ due to sticky direction behavior
         Assert.NotEqual(tvi01.Last.Value, tvi05.Last.Value);
     }
-}
+}

lib/volume/tvi/Tvi.Validation.Tests.cs

@@ -193,4 +193,4 @@ public class TviValidationTests
         int finiteCount = values.Count(v => double.IsFinite(v));
         Assert.True(finiteCount > 100, $"Expected >100 finite values, got {finiteCount}");
     }
-}
+}