fix(managed): expose dropped subscription events

Track a monotonic discarded-event count per bounded subscription for all overflow policies, including after hub sealing or disconnection. Preserve nonblocking publication and existing queue policies.

Warn once in streaming CLI output and mark TUI summaries/status as incomplete when DropOldest discarded events. Add exact overflow-counter and incomplete-marker regressions.

crates/irtt-cli/src/cmd/client/run.rs

@@ -399,6 +399,9 @@ fn run_group_stream(
             }
         }
     }
+    if let Some(warning) = dropped_event_warning(events.dropped_events()) {
+        eprintln!("{warning}");
+    }
 
     if outcome.end_reason == ManagedGroupEndReason::Cancelled && !interrupted {
         return Err("managed client group was cancelled".into());
@@ -446,6 +449,14 @@ fn report_target_failure(target: &ManagedTargetOutcome) {
     }
 }
 
+fn dropped_event_warning(dropped_events: u64) -> Option<String> {
+    (dropped_events > 0).then(|| {
+        format!(
+            "irtt-rs: warning: dropped {dropped_events} managed group events; output and statistics may be incomplete"
+        )
+    })
+}
+
 fn estimated_group_completion_grace(args: &ClientArgs) -> Duration {
     let open_timeout: Duration = args.to_client_config().open_timeouts.iter().sum();
     open_timeout
@@ -598,6 +609,14 @@ mod tests {
         OutputConfig::new(format, columns, header, verbose, false).unwrap()
     }
 
+    #[test]
+    fn dropped_event_warning_marks_statistics_incomplete() {
+        assert_eq!(dropped_event_warning(0), None);
+        let warning = dropped_event_warning(7).unwrap();
+        assert!(warning.contains("dropped 7 managed group events"));
+        assert!(warning.contains("statistics may be incomplete"));
+    }
+
     #[test]
     fn output_helper_streams_and_collects_events() {
         let sent_at = test_timestamp(Duration::from_secs(1));