trace: 标注被截断的链路消息，避免误读为模型未写完

2026-10-29 实弹：468 字 final_answer 在链路里只剩前 300 字、
断在 fu 后，控制台照原样当助手回复展示，用户误以为模型
没写完。截断本身是设计（防链路文件写爆），缺的是标记。

- host.py _summarize_trace_item：agentMessage 超 300 字时
  条目带 truncated=True，短消息不带，完整回复仍在任务
  result_text 里，不在链路条目里。
- 控制台：TraceEntry 加 truncated 字段，mapTrace 与
  traceLineText 在被截断的消息后标注“链路摘要已截断至
  300 字，完整回复见右侧任务结果”，console.html 为构建产物同步。
- 单测：tests/test_host_trace.py 新增截断标记用例（468 字
  截 300 字且带标记、短消息不带标记）。

验证：host 10 项、cloud test_task_trace 14 项全过；
React tsc+vite 构建通过，产物 322151 字节、含截断标注、
含 #150 的 total_tokens/首字/总耗时，无回退。

cloud/console-react/src/api/client.ts

@@ -117,7 +117,7 @@ export function traceLineText(e: TraceEntry): string {
   let body = "";
   if (e.kind === "exec") body = (e.command || "") + "（exit=" + (e.exitCode ?? "") + "，" + (e.durationMs ?? "") + "ms，cwd=" + (e.cwd || "") + "）";
   else if (e.kind === "file") body = (e.path || "") + " " + (e.change || "") + " " + (e.status || "");
-  else if (e.kind === "message") body = (e.phase ? "[" + e.phase + "] " : "") + (e.text || "");
+  else if (e.kind === "message") body = (e.phase ? "[" + e.phase + "] " : "") + (e.text || "") + (e.truncated ? "（链路摘要已截断至 300 字，完整回复见右侧任务结果）" : "");
   else if (e.kind === "reasoning") body = e.summary || "";
   else if (e.kind === "tool") body = (e.server || "") + "/" + (e.tool || "") + " " + (e.status || "");
   else if (e.kind === "call") body = e.name || "";

cloud/console-react/src/api/types.ts

@@ -40,7 +40,7 @@ export interface Automation { id: string; name?: string; status?: string; due?:
 export interface Member { user_id: string; username?: string; role?: string }
 export interface SkillItem { name?: string; id?: string; description?: string; detail?: string }
 export interface McpServer { name?: string; id?: string; status?: string; detail?: string; details?: string; state?: string }
-export interface TraceEntry { id?: string; kind?: string; command?: string; exitCode?: number | string; durationMs?: number | string; cwd?: string; path?: string; change?: string; status?: string; phase?: string; text?: string; summary?: string; server?: string; tool?: string; name?: string; prompt?: string }
+export interface TraceEntry { id?: string; kind?: string; command?: string; exitCode?: number | string; durationMs?: number | string; cwd?: string; path?: string; change?: string; status?: string; phase?: string; text?: string; summary?: string; server?: string; tool?: string; name?: string; prompt?: string; truncated?: boolean }
 export interface Agent { kind?: string; name?: string; status?: string; prompt?: string; updated_ts?: number; calls?: TraceEntry[] }
 export interface ThreadInfo { id?: string; name?: string; thread_name?: string; archived?: boolean | null; cwd?: string; turns?: number; turn_count?: number; turns_count?: number }
 export interface Triage {