Add SwiftSyntax602 version marker module

Author: ahoppen

Package.swift

@@ -242,6 +242,11 @@ let package = Package(
       path: "Sources/VersionMarkerModules/SwiftSyntax601"
     ),
 
+    .target(
+      name: "SwiftSyntax602",
+      path: "Sources/VersionMarkerModules/SwiftSyntax602"
+    ),
+
     // MARK: SwiftSyntaxBuilder
 
     .target(

Sources/VersionMarkerModules/SwiftSyntax602/Empty.swift

@@ -0,0 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+// The SwiftSyntax602 module is intentionally empty.
+// It serves as an indicator which version of swift-syntax a package is building against.
+// See the 'Macro Versioning.md' document for more details.