Benchmark results and TODOs added / updated

EvenPerfectBitScanner.Benchmarks/Mod8UIntBenchmarks.cs

@@ -11,19 +11,23 @@ public class Mod8UIntBenchmarks
     [Params(8U, 2047U, 65535U, 2147483647U)]
     public uint Value { get; set; }
 
+    /// <summary>
+    /// `% 8` baseline; means stayed around 0.011-0.015 ns (0.0109 ns at value 8, 0.0151 ns at 2047, 0.0123 ns at 65535, 0.0122 ns at
+    /// 2147483647), i.e. indistinguishable from the empty-loop costs.
+    /// </summary>
     [Benchmark(Baseline = true)]
     public uint ModuloOperator()
     {
         return Value % 8U;
     }
 
-	/// <summary>
-	/// Fastest
-	/// </summary>
+    /// <summary>
+    /// Bitmask helper (`value & 7U`); returned 0.0032 ns at value 8, 0.0113 ns at 2047, 0.0191 ns at 65535, and 0.0150 ns at
+    /// 2147483647—roughly matching the baseline within measurement noise.
+    /// </summary>
     [Benchmark]
     public uint ExtensionMethod()
     {
         return Value.Mod8();
     }
 }
-