feat: add CuttingParameters and configuration classes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

OpenNest.Core/CNC/CuttingStrategy/AssignmentParameters.cs

@@ -0,0 +1,9 @@
+namespace OpenNest.CNC.CuttingStrategy
+{
+    public class AssignmentParameters
+    {
+        public SequenceMethod Method { get; set; } = SequenceMethod.Advanced;
+        public string Preference { get; set; } = "ILAT";
+        public double MinGeometryLength { get; set; } = 0.01;
+    }
+}