Use fresh implicit sessions and raw live terminal output

tests/integration_smoke.rs

@@ -462,6 +462,38 @@ fn pty_sets_terminal_environment() {
     );
 }
 
+#[test]
+fn live_output_forwards_terminal_control_sequences() {
+    let dir = tempfile::tempdir().unwrap();
+    let port = free_udp_port();
+    let config = write_server_config(&dir, port);
+    let mut server = start_server(&dir, &config);
+    let (socket, bootstrap, ok) = direct_attach(&config, port, "read-write");
+
+    let input = Input {
+        bytes: b"printf '\\033[?1049hDOSH_ALT_SCREEN\\033[?1049l\\n'\n".to_vec(),
+    };
+    send_encrypted(
+        &socket,
+        port,
+        PacketKind::Input,
+        ok.client_id,
+        2,
+        0,
+        &bootstrap.session_key,
+        &protocol::to_body(&input).unwrap(),
+    );
+    let text = collect_frame_text(&socket, &bootstrap.session_key, 2000);
+
+    let _ = server.kill();
+    let _ = server.wait();
+
+    assert!(
+        text.contains("\x1b[?1049h") && text.contains("\x1b[?1049l"),
+        "expected raw alternate-screen control sequences, got {text:?}"
+    );
+}
+
 #[test]
 fn resume_updates_udp_endpoint_for_roaming() {
     let dir = tempfile::tempdir().unwrap();