chore: import upstream snapshot with attribution

Sources/Services/ContainerAPIService/Client/ClientDiskUsage.swift

@@ -0,0 +1,40 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 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 ContainerXPC
+import ContainerizationError
+import Foundation
+
+/// Client API for disk usage operations
+public struct ClientDiskUsage {
+    static let serviceIdentifier = "com.apple.container.apiserver"
+
+    /// Get disk usage statistics for all resource types
+    public static func get() async throws -> DiskUsageStats {
+        let client = XPCClient(service: serviceIdentifier)
+        let message = XPCMessage(route: .systemDiskUsage)
+        let reply = try await client.send(message)
+
+        guard let responseData = reply.dataNoCopy(key: .diskUsageStats) else {
+            throw ContainerizationError(
+                .internalError,
+                message: "invalid response from server: missing disk usage data"
+            )
+        }
+
+        return try JSONDecoder().decode(DiskUsageStats.self, from: responseData)
+    }
+}