Rename SawCut library to CutList.Core

Rename the core library project from SawCut to CutList.Core for consistent
branding across the solution. This includes:
- Rename project folder and .csproj file
- Update namespace from SawCut to CutList.Core
- Update all using statements and project references

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CutList.Core/Nesting/Result.cs

@@ -0,0 +1,40 @@
+using System.Collections.Generic;
+
+namespace CutList.Core.Nesting
+{
+    public class Result
+    {
+        private readonly List<BinItem> _itemsNotUsed;
+        private readonly List<Bin> _bins;
+
+        public Result()
+        {
+            _itemsNotUsed = new List<BinItem>();
+            _bins = new List<Bin>();
+        }
+
+        public IReadOnlyList<BinItem> ItemsNotUsed => _itemsNotUsed;
+
+        public IReadOnlyList<Bin> Bins => _bins;
+
+        public void AddItemNotUsed(BinItem item)
+        {
+            _itemsNotUsed.Add(item);
+        }
+
+        public void AddItemsNotUsed(IEnumerable<BinItem> items)
+        {
+            _itemsNotUsed.AddRange(items);
+        }
+
+        public void AddBin(Bin bin)
+        {
+            _bins.Add(bin);
+        }
+
+        public void AddBins(IEnumerable<Bin> bins)
+        {
+            _bins.AddRange(bins);
+        }
+    }
+}