fix: handle ReminderRollup in agent/manager response patterns

Add the ReminderRollup variant to exhaustive pattern matches
in both hive-ag3nt and hive-m1nd binaries.

hive-ag3nt/src/bin/hive-ag3nt.rs

@@ -271,6 +271,7 @@ async fn serve(
                 | AgentResponse::QuestionQueued { .. }
                 | AgentResponse::LooseEnds { .. }
                 | AgentResponse::PendingRemindersCount { .. }
+                | AgentResponse::ReminderRollup { .. }
                 | AgentResponse::Whoami { .. },
             ) => {
                 tracing::warn!("recv produced unexpected response kind");