refactor: move CutParameters to OpenNest.Api namespace with new properties

Relocates CutParameters from OpenNest namespace to OpenNest.Api, adds
LeadInLength and PostProcessor properties, and provides a typed Default
factory. Updates Timing.cs, the WinForms project reference, and the three
consuming forms to resolve the type from the new namespace.

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

OpenNest.Core/CutParameters.cs

@@ -1,15 +1,21 @@
-using System;
+using System;
 
-namespace OpenNest
+namespace OpenNest.Api;
+
+public class CutParameters
 {
-    public class CutParameters
+    public double Feedrate { get; set; }
+    public double RapidTravelRate { get; set; }
+    public TimeSpan PierceTime { get; set; }
+    public double LeadInLength { get; set; }
+    public string PostProcessor { get; set; }
+    public Units Units { get; set; }
+
+    public static CutParameters Default => new()
     {
-        public double Feedrate { get; set; }
-
-        public double RapidTravelRate { get; set; }
-
-        public TimeSpan PierceTime { get; set; }
-
-        public Units Units { get; set; }
-    }
+        Feedrate = 100,
+        RapidTravelRate = 300,
+        PierceTime = TimeSpan.FromSeconds(0.5),
+        Units = OpenNest.Units.Inches
+    };
 }

OpenNest.Core/Timing.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Linq;
+using OpenNest.Api;
 using OpenNest.CNC;
 using OpenNest.Converters;
 using OpenNest.Geometry;

OpenNest.Tests/Api/CutParametersTests.cs

@@ -0,0 +1,35 @@
+using OpenNest.Api;
+
+namespace OpenNest.Tests.Api;
+
+public class CutParametersTests
+{
+    [Fact]
+    public void Default_HasExpectedValues()
+    {
+        var cp = CutParameters.Default;
+
+        Assert.Equal(100, cp.Feedrate);
+        Assert.Equal(300, cp.RapidTravelRate);
+        Assert.Equal(TimeSpan.FromSeconds(0.5), cp.PierceTime);
+        Assert.Equal(Units.Inches, cp.Units);
+    }
+
+    [Fact]
+    public void Properties_AreSettable()
+    {
+        var cp = new CutParameters
+        {
+            Feedrate = 200,
+            RapidTravelRate = 500,
+            PierceTime = TimeSpan.FromSeconds(1.0),
+            LeadInLength = 0.25,
+            PostProcessor = "CL-707",
+            Units = Units.Millimeters
+        };
+
+        Assert.Equal(200, cp.Feedrate);
+        Assert.Equal(0.25, cp.LeadInLength);
+        Assert.Equal("CL-707", cp.PostProcessor);
+    }
+}

OpenNest/Forms/CutParametersForm.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Windows.Forms;
+using OpenNest.Api;
 
 namespace OpenNest.Forms
 {

OpenNest/Forms/EditNestForm.cs

@@ -5,6 +5,7 @@ using System.Drawing;
 using System.IO;
 using System.Linq;
 using System.Windows.Forms;
+using OpenNest.Api;
 using OpenNest.Actions;
 using OpenNest.CNC.CuttingStrategy;
 using OpenNest.Collections;

OpenNest/Forms/TimingForm.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Windows.Forms;
+using OpenNest.Api;
 
 namespace OpenNest.Forms
 {

OpenNest/OpenNest.csproj

@@ -11,6 +11,7 @@
     <Compile Remove="Controls\LayoutViewGL.cs" />
   </ItemGroup>
   <ItemGroup>
+    <ProjectReference Include="..\OpenNest.Api\OpenNest.Api.csproj" />
     <ProjectReference Include="..\OpenNest.Core\OpenNest.Core.csproj" />
     <ProjectReference Include="..\OpenNest.Engine\OpenNest.Engine.csproj" />
     <ProjectReference Include="..\OpenNest.Gpu\OpenNest.Gpu.csproj" />