Remove crafty namespace from solver

Solver/RootScores.cs

@@ -0,0 +1,18 @@
+using System.Runtime.InteropServices;
+
+namespace Craftimizer.Solver;
+
+[StructLayout(LayoutKind.Auto)]
+public sealed class RootScores
+{
+    public float ScoreSum;
+    public float MaxScore;
+    public int Visits;
+
+    public void Visit(float score)
+    {
+        ScoreSum += score;
+        MaxScore = Math.Max(MaxScore, score);
+        Visits++;
+    }
+}