fix(#2629): exclude agent's own messages from unread sweep

Gate the unread sweep on sender: skip rooms where the latest unread message
was sent by the agent itself. This prevents self-authored messages from
triggering an unread notification and causing a self-wake loop.

Fixes: #2629

hive-matrix-mcp/src/handlers.rs

@@ -890,6 +890,7 @@ pub async fn collect_unread_with_ids(
 ) -> Vec<(matrix_sdk::ruma::OwnedRoomId, crate::protocol::RoomUnread)> {
     use crate::protocol::RoomUnread;
     let mut result = Vec::new();
+    let own_user_id = client.user_id();
     for room in client.joined_rooms() {
         let count =
             u32::try_from(room.unread_notification_counts().notification_count).unwrap_or(u32::MAX);
@@ -902,6 +903,13 @@ pub async fn collect_unread_with_ids(
         } else {
             (None, None)
         };
+        // Skip rooms where the newest unread event was sent by the agent itself.
+        // Self-authored messages should not trigger an unread notification.
+        if let (Some(ref sender), Some(own_id)) = (&last_sender, own_user_id) {
+            if sender == own_id.as_str() {
+                continue;
+            }
+        }
         result.push((
             room.room_id().to_owned(),
             RoomUnread {