docs: comment on empty event_id fallback in admin-room poll

hive-c0re/src/matrix.rs

@@ -542,6 +542,9 @@ async fn admin_room_send_and_poll<T>(
             for event in events {
                 // Stop as soon as we reach our own command — everything
                 // older (further into the list) predates our request.
+                // If our_event_id is empty (malformed PUT response), we skip
+                // this guard and inspect all 20 events — slight risk of a
+                // false match from an older response, but an acceptable fallback.
                 if !our_event_id.is_empty()
                     && event["event_id"].as_str() == Some(our_event_id.as_str())
                 {