Clarify cycle stepper reset inlining

PerfectNumbers.Core/Gpu/GpuConstants.cs

@@ -1,8 +1,11 @@
 namespace PerfectNumbers.Core.Gpu
 {
-	public static class GpuConstants
-	{
-		public const int ScanBatchSize = 2_097_152;
-		public const int GpuCycleStepsPerInvocation = 256;
+        public static class GpuConstants
+        {
+                public const int ScanBatchSize = 2_097_152;
+                public const int GpuCycleStepsPerInvocation = 256;
+                // TODO: Auto-tune these GPU constants per accelerator so batch sizing aligns with the fastest kernel
+                // configuration reported by the Pow2Mod and divisor-cycle benchmarks.
     }
-}
+}
+