// Generates ONLY the tonic gRPC service stubs for `macp.v1`. The message types
// are generated once in the `macp-pb` crate; `.extern_path()` redirects every
// `.macp.v1` message reference in the service code to `::macp_pb::pb`, so they
// are not regenerated here. This keeps message types in a single transport-free
// crate while the service (which needs tonic) lives with the runtime.