mctp/client-ipc: restrict to bare-metal targets via target_compatible_with

services/mctp/client-ipc/BUILD.bazel

diff --git a/services/mctp/client-ipc/BUILD.bazel b/services/mctp/client-ipc/BUILD.bazel
index 06f23f7..82a0a86 100644
--- a/services/mctp/client-ipc/BUILD.bazel
+++ b/services/mctp/client-ipc/BUILD.bazel
@@ -9,6 +9,7 @@
     crate_name = "openprot_mctp_client_ipc",
     edition = "2024",
     tags = ["kernel"],
+    target_compatible_with = ["@platforms//os:none"],
     visibility = ["//visibility:public"],
     deps = [
         "//services/mctp/api:mctp_api",

services/mctp/client-ipc/src/lib.rs

diff --git a/services/mctp/client-ipc/src/lib.rs b/services/mctp/client-ipc/src/lib.rs
index cadc388..033cba3 100644
--- a/services/mctp/client-ipc/src/lib.rs
+++ b/services/mctp/client-ipc/src/lib.rs
@@ -1,4 +1,5 @@
 // Licensed under the Apache-2.0 license
+// SPDX-License-Identifier: Apache-2.0
 
 //! MCTP IPC Client
 //!