phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0

tests/development/test_builtin_inheritance_without_extends.hako

@@ -0,0 +1,9 @@
+// Test if MathBox is recognized as a built-in type
+local instance
+instance = new MathBox()
+
+local result
+result = instance.sin(1.5708)
+print("Sin(π/2) = " + result.toString())
+
+print("MathBox test complete!")