test: setup common stability and robustness properties tracking

lib/volume/twap/Twap.Quantower.Tests.cs

@@ -284,4 +284,4 @@ public class TwapIndicatorTests
             Assert.True(double.IsFinite(val), $"Value at bar {i} should be finite");
         }
     }
-}
+}

lib/volume/twap/Twap.Tests.cs

@@ -421,4 +421,4 @@ public class TwapTests
 
         Assert.Equal(100, result.Value, 10);
     }
-}
+}

lib/volume/twap/Twap.Validation.Tests.cs

@@ -178,4 +178,4 @@ public class TwapValidationTests
                 $"TWAP {v} should be within reasonable bounds of price range [{minPrice}, {maxPrice}]");
         }
     }
-}
+}