host
585242fc8f
长任务 P0 三件：断点进库、错误分类+熔断、Run/Step 时间线
断点进库：task_checkpoints 表（PG 新库 + 老库幂等补表 + 迁移清单
对齐）；worker 在 goal 任务执行期间每 30 秒把磁盘 host-state 断点
镜像进库，终局再补一次；断点续跑认领前，若 host-state 条目丢失
但库里有断点，先按库断点重建最小条目再跑，库里也没有断点时不
造假、走原有拒绝路径。
错误分类+熔断：sandbox 四处解析加永久错误分支（KeyError、配置
缺失等无结论异常退出判 failed 死信，不再判 interrupted；host 已
明言 interrupted 的不受影响，未知错误不分类）；worker 自动恢复
加退避（10 秒起指数退避、封顶 300 秒）与无进展熔断（库断点轮次
连续 3 次不变即标 auto_resume_stalled 等人工）。
时间线：task_steps 表 + host 每轮写 host-steps 步骤文件 + worker
导入；GET /tasks/{id}/timeline 一次返回 steps 与 checkpoints；
认领、暂停、自动恢复、终局都记步骤。旧任务返回空数组，不编造。
单测：cloud/tests/test_p0_three.py 14 项（分类、熔断、镜像重建、
步骤导入去重、timeline 接口）。
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