feat: add EdgeStartSequencer

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

OpenNest.Tests/Sequencing/EdgeStartSequencerTests.cs

@@ -0,0 +1,31 @@
+using System.Collections.Generic;
+using OpenNest.CNC;
+using OpenNest.Engine.Sequencing;
+using OpenNest.Geometry;
+using Xunit;
+
+namespace OpenNest.Tests.Sequencing;
+
+public class EdgeStartSequencerTests
+{
+    private static Part MakePartAt(double x, double y) => TestHelpers.MakePartAt(x, y);
+
+    [Fact]
+    public void SortsByDistanceFromNearestEdge()
+    {
+        var plate = new Plate(60, 120);
+        var edgePart = MakePartAt(1, 1);
+        var centerPart = MakePartAt(25, 55);
+        var midPart = MakePartAt(10, 10);
+        plate.Parts.Add(edgePart);
+        plate.Parts.Add(centerPart);
+        plate.Parts.Add(midPart);
+
+        var sequencer = new EdgeStartSequencer();
+        var result = sequencer.Sequence(plate.Parts.ToList(), plate);
+
+        Assert.Same(edgePart, result[0].Part);
+        Assert.Same(midPart, result[1].Part);
+        Assert.Same(centerPart, result[2].Part);
+    }
+}