Scaffold the Xcode project — XcodeGen, Swift 6, sandboxed

XcodeGen project (codename Kanban, display name Lanework, bundle id
dev.rzen.indie.Kanban): macOS 26+ app target with Swift 6 strict
concurrency, app sandbox with user-selected file access and app-scoped
bookmark entitlements, plus unit-test (Swift Testing) and XCUITest
targets wired into the Kanban scheme.

Claude-Session: https://claude.ai/code/session_018BjQRYBR6jQja3jCRi5S3A

.gitignore

@@ -0,0 +1,11 @@
+# Generated by XcodeGen — project.yml is the source of truth
+Kanban.xcodeproj/
+
+# Xcode
+DerivedData/
+build/
+*.xcresult
+xcuserdata/
+
+# macOS
+.DS_Store