DONE
- task: T-020
- work commits: 8208118, 0ef23ff
- merge commit on main: 2a38feb75c1246a2f1d028e803dbce450d5f4d7d
- PR: #73
- default branch contains task status DONE
- all recorded gates passed; claim is released
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目标
建立默认关闭、回环可见的 Bell Event→Rule→Alert→ack/close 最小纵切,冻结规则版本、并发幂等和 append-only 状态迁移语义。
规格
docs/tasks/T-020.md边界
不包含证据切片、升级计时、联系人/排班、通知 provider、正式 JWT/RBAC 或最终前端框架。
CLAIM
477afa6ba2READY FOR REVIEW
8208118DONE
8208118,0ef23ff2a38feb75c