test: setup common stability and robustness properties tracking

lib/volatility/massi/Massi.Quantower.Tests.cs

@@ -206,4 +206,4 @@ public class MassiIndicatorTests
         Assert.True(double.IsFinite(smallRangeVal));
         Assert.True(double.IsFinite(largeRangeVal));
     }
-}
+}

lib/volatility/massi/Massi.Tests.cs

@@ -724,4 +724,4 @@ public class MassiTests
         // Both should produce same result
         Assert.Equal(massi1.Last.Value, massi2.Last.Value, Tolerance);
     }
-}
+}

lib/volatility/massi/Massi.Validation.Tests.cs

@@ -275,4 +275,4 @@ public class MassiValidationTests
         int finiteCount = values.Count(v => double.IsFinite(v));
         Assert.True(finiteCount > 100, $"Expected >100 finite values, got {finiteCount}");
     }
-}
+}