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/backend/beaver/tasks/router.py

@@ -69,6 +69,14 @@ class MainAgentRouter:
         reason = str(payload.get("reason") or raw_action or "llm_router")
         short_title = _clean_short_title(payload.get("short_title") or payload.get("title"))
 
+        if raw_action in {"revise_task", "revise", "revision", "needs_revision"}:
+            return MainAgentDecision(
+                mode="task",
+                reason=reason,
+                starts_new_task=active_task is None,
+                short_title=short_title,
+                action="revise_task" if active_task is not None else "create_task",
+            )
         if raw_action in {"continue_task", "continue", "task"}:
             return MainAgentDecision(
                 mode="task",
@@ -146,13 +154,16 @@ class MainAgentRouter:
             "Actions:\n"
             "- simple_chat: no Task should be created or continued.\n"
             "- continue_task: keep the user in the active Task.\n"
+            "- revise_task: user asks to change, correct, refine, expand, reformat, or redo the latest active Task result.\n"
             "- new_task: start a separate new Task.\n"
             "- close_task: user explicitly says the active Task is done/satisfactory/finished.\n"
             "- abandon_task: user explicitly says to stop, cancel, abandon, or no longer do the active Task.\n\n"
             "Critical policy:\n"
-            "- If there is an active Task, choose continue_task unless the user's topic is completely unrelated "
+            "- If there is an active Task, choose continue_task or revise_task unless the user's topic is completely unrelated "
             "to that Task or the user explicitly closes/abandons it.\n"
-            "- Follow-up questions, corrections, partial changes, extra constraints, and result discussion stay in continue_task.\n"
+            "- Choose revise_task when the active Task is awaiting feedback or needs revision and the user asks for changes "
+            "such as '改一下', '加上', '删除', '换成', '再详细点', '格式改成', '不要', or equivalent wording.\n"
+            "- Choose continue_task for neutral follow-up questions or additional next steps that do not imply dissatisfaction with the previous result.\n"
             "- Use new_task only when the user clearly asks to start a different task.\n"
             "- If there is no active Task, choose new_task only for work that requires execution, iteration, tools, files, "
             "implementation, validation, or multi-step completion. Otherwise choose simple_chat.\n"