Add fresh default sessions and terminal status handling

tests/integration_smoke.rs

@@ -68,6 +68,8 @@ fn attach_once(dir: &tempfile::TempDir, port: u16, cache: bool) -> std::process:
     let mut cmd = Command::new(client);
     cmd.arg("--local-auth")
         .arg("--attach-only")
+        .arg("--session")
+        .arg("default")
         .arg("--dosh-port")
         .arg(port.to_string())
         .arg("local")
@@ -388,6 +390,77 @@ fn resize_updates_pty_size() {
     );
 }
 
+#[test]
+fn pty_exit_sends_closed_frame() {
+    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"exit\n".to_vec(),
+    };
+    send_encrypted(
+        &socket,
+        port,
+        PacketKind::Input,
+        ok.client_id,
+        2,
+        0,
+        &bootstrap.session_key,
+        &protocol::to_body(&input).unwrap(),
+    );
+
+    let mut closed = false;
+    let deadline = std::time::Instant::now() + Duration::from_secs(3);
+    while std::time::Instant::now() < deadline {
+        if let Some((_header, frame)) = recv_frame(&socket, &bootstrap.session_key) {
+            if frame.closed {
+                closed = true;
+                break;
+            }
+        }
+    }
+
+    let _ = server.kill();
+    let _ = server.wait();
+
+    assert!(closed, "expected closed frame after shell exit");
+}
+
+#[test]
+fn pty_sets_terminal_environment() {
+    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 \"$TERM\\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("xterm-256color"),
+        "expected TERM=xterm-256color, got {text:?}"
+    );
+}
+
 #[test]
 fn resume_updates_udp_endpoint_for_roaming() {
     let dir = tempfile::tempdir().unwrap();