wire reminder ops into the in-agent socket dispatch (#2635 inc 1)

hive-agent-sock/src/lib.rs

@@ -78,6 +78,11 @@ pub enum Request {
     /// This agent's pending-reminder count — used by the pre-`remind` cap
     /// check and the harness's own turn-stats sink.
     CountPendingReminders,
+    /// Scheduled/delivered/pending reminder counts over a trailing
+    /// `since_secs` window (`0` = all time) — the harness's own `/api/stats`
+    /// reminder-activity chart data (was `hive-core-agent-sock`'s
+    /// `ReminderRollup` against the broker; now served from the local store).
+    ReminderRollup { since_secs: u64 },
 }
 
 /// A response on the in-agent socket. Serialised with a `kind` tag,
@@ -94,6 +99,8 @@ pub enum Response {
     LooseEnds { loose_ends: Vec<LooseEnd> },
     /// `CountPendingReminders` result.
     PendingRemindersCount { count: u64 },
+    /// `ReminderRollup` result.
+    ReminderRollup { stats: hive_sh4re::ReminderStats },
     /// Op failed; `message` is operator-facing.
     Err { message: String },
 }