feat(task): 添加任务修订功能和超时处理机制

添加了 `revise_task` 路由动作类型，允许用户修改、纠正或重新执行最新活动任务结果。
实现了工具失败指导原则，防止相同类别工具重复失败。
为任务规划器添加了超时处理机制，避免长时间等待。

BREAKING CHANGE: 任务路由逻辑已更新，新增 `revise_task` 动作类型。

fix(api): 修复任务详情API返回完整流程投影

修复了任务详情API端点，现在会包含过滤后的流程运行、事件和工件信息，
并确保时间戳字段正确序列化。

refactor(engine): 优化任务技能解析器摘要节点处理

改进了任务技能解析器对摘要节点的处理逻辑，对于仅依赖文本生成功能的摘要节
点不再分配具体技能，直接使用依赖项输出进行汇总。

test: 增加任务修订和超时处理测试用例

添加了测试用例验证任务修订输入记录反馈、超时回退到单模式以及
摘要节点技能解析等新功能。

app-instance/frontend/lib/chat-messages.test.ts

@@ -0,0 +1,74 @@
+import { describe, expect, it } from 'vitest';
+
+import { getTaskCardMessageIndexes, mergeServerWithPendingUsers } from '@/lib/chat-messages';
+import type { ChatMessage } from '@/types';
+
+describe('chat message helpers', () => {
+  it('keeps pending local user messages after server refreshes', () => {
+    const serverMessages: ChatMessage[] = [
+      {
+        role: 'assistant',
+        content: 'Earlier answer',
+        timestamp: '2026-05-21T08:00:00.000Z',
+      },
+    ];
+    const localMessages: ChatMessage[] = [
+      ...serverMessages,
+      {
+        role: 'user',
+        content: 'Please continue',
+        timestamp: '2026-05-21T08:01:00.000Z',
+      },
+    ];
+
+    expect(mergeServerWithPendingUsers(serverMessages, localMessages)).toEqual([
+      ...serverMessages,
+      localMessages[1],
+    ]);
+  });
+
+  it('does not duplicate local user messages already persisted by the server', () => {
+    const serverMessages: ChatMessage[] = [
+      {
+        role: 'user',
+        content: 'Please continue',
+        timestamp: '2026-05-21T08:01:00.000Z',
+      },
+    ];
+    const localMessages: ChatMessage[] = [
+      {
+        role: 'user',
+        content: 'Please continue',
+        timestamp: '2026-05-21T08:01:01.000Z',
+      },
+    ];
+
+    expect(mergeServerWithPendingUsers(serverMessages, localMessages)).toEqual(serverMessages);
+  });
+
+  it('shows a task card only on the latest assistant message for the same task', () => {
+    const messages: ChatMessage[] = [
+      {
+        role: 'assistant',
+        content: 'I will start.',
+        run_id: 'run-1',
+        task_id: 'task-1',
+      },
+      {
+        role: 'assistant',
+        content: 'I found data.',
+        run_id: 'run-1',
+        task_id: 'task-1',
+      },
+      {
+        role: 'assistant',
+        content: 'Final answer.',
+        run_id: 'run-1',
+        task_id: 'task-1',
+        task_status: 'awaiting_feedback',
+      },
+    ];
+
+    expect(Array.from(getTaskCardMessageIndexes(messages))).toEqual([2]);
+  });
+});