Added static IsPrimeGpu

PerfectNumbers.Core/PrimeTester.cs

@@ -15,6 +15,8 @@ public sealed class PrimeTester(bool useInternal = false)
         // indirection shows up when we sieve millions of candidates per second.
         IsPrimeInternal(n, ct);
 
+	public static bool IsPrimeGpu(ulong n) => new PrimeTester().IsPrimeGpu(n, CancellationToken.None);
+
 	// Optional GPU-assisted primality: batched small-prime sieve on device.
 	public bool IsPrimeGpu(ulong n, CancellationToken ct)
     {