feat: add AdvancedSequencer with row grouping and serpentine

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

OpenNest.Tests/Sequencing/AdvancedSequencerTests.cs

@@ -0,0 +1,69 @@
+using System.Collections.Generic;
+using OpenNest.CNC;
+using OpenNest.CNC.CuttingStrategy;
+using OpenNest.Engine.Sequencing;
+using OpenNest.Geometry;
+using Xunit;
+
+namespace OpenNest.Tests.Sequencing;
+
+public class AdvancedSequencerTests
+{
+    private static Part MakePartAt(double x, double y) => TestHelpers.MakePartAt(x, y);
+
+    [Fact]
+    public void GroupsIntoRows_NoAlternate()
+    {
+        var plate = new Plate(100, 100);
+        var row1a = MakePartAt(10, 10);
+        var row1b = MakePartAt(30, 10);
+        var row2a = MakePartAt(10, 50);
+        var row2b = MakePartAt(30, 50);
+        plate.Parts.Add(row1a);
+        plate.Parts.Add(row1b);
+        plate.Parts.Add(row2a);
+        plate.Parts.Add(row2b);
+
+        var parameters = new SequenceParameters
+        {
+            Method = SequenceMethod.Advanced,
+            MinDistanceBetweenRowsColumns = 5.0,
+            AlternateRowsColumns = false
+        };
+        var sequencer = new AdvancedSequencer(parameters);
+        var result = sequencer.Sequence(plate.Parts.ToList(), plate);
+
+        Assert.Same(row1a, result[0].Part);
+        Assert.Same(row1b, result[1].Part);
+        Assert.Same(row2a, result[2].Part);
+        Assert.Same(row2b, result[3].Part);
+    }
+
+    [Fact]
+    public void SerpentineAlternatesDirection()
+    {
+        var plate = new Plate(100, 100);
+        var r1Left = MakePartAt(10, 10);
+        var r1Right = MakePartAt(30, 10);
+        var r2Left = MakePartAt(10, 50);
+        var r2Right = MakePartAt(30, 50);
+        plate.Parts.Add(r1Left);
+        plate.Parts.Add(r1Right);
+        plate.Parts.Add(r2Left);
+        plate.Parts.Add(r2Right);
+
+        var parameters = new SequenceParameters
+        {
+            Method = SequenceMethod.Advanced,
+            MinDistanceBetweenRowsColumns = 5.0,
+            AlternateRowsColumns = true
+        };
+        var sequencer = new AdvancedSequencer(parameters);
+        var result = sequencer.Sequence(plate.Parts.ToList(), plate);
+
+        Assert.Same(r1Left, result[0].Part);
+        Assert.Same(r1Right, result[1].Part);
+        Assert.Same(r2Right, result[2].Part);
+        Assert.Same(r2Left, result[3].Part);
+    }
+}