fix(TASK-028): pin global-template exclusion, tighten timeout boundary test, reword stale hint

src/function/agents.rs

@@ -1711,7 +1711,7 @@ fn handle_reply_escalation(ctx: &mut RequestContext, args: &Value) -> Result<Val
         }
         None => Ok(json!({
             "status": "error",
-            "message": format!("No pending escalation found with id '{escalation_id}'. It may have already been replied to or timed out."),
+            "message": format!("No pending escalation found with id '{escalation_id}'. It may have already been replied to, or the child is no longer waiting (aborted, or its configured `escalation_timeout` expired)."),
         })),
     }
 }