chore: import upstream snapshot with attribution

Sources/ContainerizationOCI/Version.swift

@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025-2026 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 RuntimeSpecVersion: Sendable {
+    public let major, minor, patch: Int
+    public let dev: String
+
+    public static let current = RuntimeSpecVersion(
+        major: 1,
+        minor: 0,
+        patch: 2,
+        dev: "-dev"
+    )
+
+    public init(major: Int, minor: Int, patch: Int, dev: String) {
+        self.major = major
+        self.minor = minor
+        self.patch = patch
+        self.dev = dev
+    }
+}