tests(stdlib): reorganize and expand StandardLibrary tests

- Switch tests to use Initializer.InitializeAll for setup
- Split stdlib tests by category: Angle, Rounding, Trig (incl. hyperbolic), NumberTheory, Random
- Add comprehensive tests invoking functions via InputInterpreter.Interpret()
- Register Bernoulli in Initializer so random tests cover

src/StandardLibrary/Initializer.cs

@@ -118,6 +118,7 @@ namespace CSMic.StandardLibrary
             }
 
             inputInterpreter.RegisterFunction(new FairFlip());
+            inputInterpreter.RegisterFunction(new Bernoulli());
             inputInterpreter.RegisterFunction(new RandomUniform());
             inputInterpreter.RegisterFunction(new RandomUniformSpread());
             inputInterpreter.RegisterFunction(new RandomNormal());