fix: use activity timeout for code agent turns

scripts/src/code-agent-response-contract.mjs

@@ -18,7 +18,7 @@ const blockedCodeAgentUiLabels = new Set([
   "仍是 fallback",
   "BLOCKED 凭证缺口"
 ]);
-const timeoutPattern = /\b(?:timeout|timed out|abort|aborted|超时|请求超过)\b/iu;
+const timeoutPattern = /\b(?:timeout|timed out|abort|aborted|超时|请求超过|无新事件)\b/iu;
 
 export function classifyCodeAgentChatReadiness(payload, { realDevLive = false, httpStatus = null } = {}) {
   const providerBlock = classifyCodeAgentProviderBlock(payload, { httpStatus });
@@ -547,7 +547,7 @@ export function classifyCodeAgentBrowserFailure(error, { traceId = null } = {})
       status: "blocked",
       blocker: "timeout",
       category: "timeout",
-      chineseSummary: `超时：Code Agent 请求在配置的长时间边界内没有完成${observedTraceId ? `；traceId=${observedTraceId}` : ""}。`,
+      chineseSummary: `超时：Code Agent 在配置的活动时间边界内没有新事件${observedTraceId ? `；traceId=${observedTraceId}` : ""}。`,
       reason: message
     };
   }