Clarify cycle stepper reset inlining

PerfectNumbers.Core/RationalNumbers.cs

@@ -5,4 +5,7 @@ namespace PerfectNumbers.Core;
 public static class RationalNumbers
 {
     public static ERational Two { get; } = ERational.FromInt32(2);
+    // TODO: Precompute additional frequently used rationals (e.g., OneHalf, ThreeHalves) so hot alpha computations stop
+    // constructing them via ERational.FromInt32 at runtime.
 }
+