test: setup common stability and robustness properties tracking

lib/cycles/solar/Solar.Quantower.Tests.cs

@@ -259,4 +259,4 @@ public class SolarIndicatorTests
         Assert.Contains("Solar.Quantower.cs", indicator.SourceCodeLink, StringComparison.Ordinal);
         Assert.Contains("github.com", indicator.SourceCodeLink, StringComparison.Ordinal);
     }
-}
+}

lib/cycles/solar/Solar.Tests.cs

@@ -295,4 +295,4 @@ public class SolarTests
 
         Assert.True(cycle > 0.95, $"Expected cycle > 0.95 at 2000 summer solstice, got {cycle}");
     }
-}
+}