chore: Add Claude Code project configuration

Add .claude directory with settings and memory files for
consistent AI-assisted development.

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

.claude/mcp/CutList.Mcp.runtimeconfig.json

@@ -0,0 +1,20 @@
+{
+  "runtimeOptions": {
+    "tfm": "net8.0",
+    "frameworks": [
+      {
+        "name": "Microsoft.NETCore.App",
+        "version": "8.0.0"
+      },
+      {
+        "name": "Microsoft.AspNetCore.App",
+        "version": "8.0.0"
+      }
+    ],
+    "configProperties": {
+      "System.Reflection.Metadata.MetadataUpdater.IsSupported": false,
+      "System.Reflection.NullabilityInfoContext.IsSupported": true,
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
+    }
+  }
+}