forge_notify: explicit open/empty state, unknown states show raw value

hive-ag3nt/src/forge_notify.rs

@@ -195,7 +195,8 @@ async fn format_notification(
         let kind = match notif_state {
             "merged" => format!("{label} merged"),
             "closed" => format!("{label} closed"),
-            _ => format!("new {label}"),
+            "open" | "" => format!("new {label}"),
+            other => format!("{label}: {other}"),
         };
 
         // Fetch subject only for body/author on new (open) items — not