fix(sandbox): use SessionHandle for the sidecar supervisor session

The network-sidecar path in openshell-sandbox spawns its own supervisor
session and only compiles on Linux, so the SessionHandle return type
change was missed by the macOS check. Also drop a redundant path
qualification flagged by the Linux build.

Signed-off-by: Roland Huß <rhuss@redhat.com>

Author: rhuss

crates/openshell-sandbox/src/lib.rs

@@ -1384,7 +1384,9 @@ fn spawn_sidecar_entrypoint_handler(
             control_publisher,
         } = handler;
         let mut session_started = false;
-        let mut session_task: Option<tokio::task::JoinHandle<()>> = None;
+        let mut session_task: Option<
+            openshell_supervisor_process::supervisor_session::SessionHandle,
+        > = None;
         let mut trusted_supervisor_pid = None;
         let terminating = Arc::new(AtomicBool::new(false));
         while let Some(started) = entrypoint_rx.recv().await {

crates/openshell-supervisor-process/src/supervisor_session.rs

@@ -874,7 +874,7 @@ async fn connect_tcp_target(
     netns_fd: Option<RawFd>,
 ) -> Result<tokio::net::TcpStream, Box<dyn std::error::Error + Send + Sync>> {
     if let Some(fd) = netns_fd {
-        let (tx, rx) = tokio::sync::oneshot::channel();
+        let (tx, rx) = oneshot::channel();
         std::thread::spawn(move || {
             let result = (|| -> std::io::Result<std::net::TcpStream> {
                 #[allow(unsafe_code)]