chore: import upstream snapshot with attribution

Sources/ContainerizationExtras/AddressError.swift

@@ -0,0 +1,66 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2026 Apple Inc. and the Containerization 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.
+//===----------------------------------------------------------------------===//
+
+public struct AddressError: Error, Equatable, Hashable, CustomStringConvertible {
+    public var description: String {
+        String(describing: self.base)
+    }
+
+    @usableFromInline
+    enum Base: Equatable, Hashable, Sendable {
+        case unableToParse
+        case invalidZoneIdentifier
+        case invalidIPv4Suffix
+        case multipleEllipsis
+        case invalidHexGroup
+        case malformedAddress
+        case incompleteAddress
+    }
+
+    @usableFromInline
+    let base: Base
+
+    @inlinable
+    init(_ base: Base) { self.base = base }
+
+    public static var unableToParse: Self {
+        Self(.unableToParse)
+    }
+
+    public static var invalidZoneIdentifier: Self {
+        Self(.invalidZoneIdentifier)
+    }
+
+    public static var invalidIPv4SuffixInIPv6Address: Self {
+        Self(.invalidIPv4Suffix)
+    }
+
+    public static var multipleEllipsis: Self {
+        Self(.multipleEllipsis)
+    }
+
+    public static var invalidHexGroup: Self {
+        Self(.invalidHexGroup)
+    }
+
+    public static var malformedAddress: Self {
+        Self(.malformedAddress)
+    }
+
+    public static var incompleteAddress: Self {
+        Self(.incompleteAddress)
+    }
+}