chore: import upstream snapshot with attribution

Sources/SocketForwarder/SocketForwarderResult.swift

@@ -0,0 +1,37 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025-2026 Apple Inc. and the container project authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//===----------------------------------------------------------------------===//
+
+import NIO
+
+public struct SocketForwarderResult: Sendable {
+    private let channel: any Channel
+
+    public init(channel: Channel) {
+        self.channel = channel
+    }
+
+    public var proxyAddress: SocketAddress? { self.channel.localAddress }
+
+    public func close() {
+        self.channel.eventLoop.execute {
+            _ = channel.close()
+        }
+    }
+
+    public func wait() async throws {
+        try await self.channel.closeFuture.get()
+    }
+}