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

src/config/agent.rs

@@ -1341,6 +1341,7 @@ variables:
         assert_eq!(config.max_concurrent_agents, 4);
         assert_eq!(config.max_agent_depth, 3);
         assert_eq!(config.max_auto_continues, 10);
+        assert_eq!(config.escalation_timeout, 0);
         assert!(config.mcp_servers.is_empty());
         assert!(config.global_tools.is_empty());
         assert!(config.conversation_starters.is_empty());