refactor(cli): use unified managed frontend

crates/irtt-cli/tests/client_multi_target.rs

@@ -323,7 +323,7 @@ fn continuous_single_target_interruption_drains_final_events_and_succeeds() {
     assert!(stdout
         .lines()
         .any(|line| line.starts_with("session_closed,")));
-    assert!(stderr.contains("interrupted, closing session"), "{stderr}");
+    assert!(stderr.contains("interrupted, closing managed run"), "{stderr}");
     assert!(!stderr.contains("peer closure"), "{stderr}");
 }
 
@@ -643,7 +643,7 @@ fn explicit_group_interruption_succeeds_without_peer_close_error() {
         stdout.lines().any(|line| line.starts_with("b,")),
         "{stdout}"
     );
-    assert!(stderr.contains("interrupted, closing group"), "{stderr}");
+    assert!(stderr.contains("interrupted, closing managed run"), "{stderr}");
     assert!(!stderr.contains("peer closure"), "{stderr}");
 }