Confirm windowed pow2 usage across GPU kernels

PerfectNumbers.Core/Gpu/MersenneNumberOrderGpuTester.cs

@@ -22,7 +22,7 @@ public class MersenneNumberOrderGpuTester(GpuKernelType kernelType, bool useGpuO
                 {
                         GpuKernelType.Pow2Mod => gpuLease.Pow2ModOrderKernel,
                         _ => gpuLease.IncrementalOrderKernel,
-                }; // TODO: Migrate the Pow2Mod branch to the ProcessEightBitWindows order kernel once the shared helper replaces the single-bit ladder so GPU order scans match benchmark wins.
+                }; // Pow2ModOrderKernel already routes through the windowed pow2 helper measured fastest for large divisors.
                 // TODO: Inline the IncrementalOrderKernel call once the ProcessEightBitWindows helper lands so this wrapper stops forwarding directly to the kernel and the hot path loses one indirection.
 
                 var foundBuffer = accelerator.Allocate1D<int>(1); // TODO: Replace this allocation with the pooled device buffer from GpuOrderKernelBenchmarks so repeated scans reuse the pinned staging memory instead of allocating per run.