hr-system/docs/01-design/iteration1-task-breakdown.md

（正本13,471B在工作区 repos/hr-system/docs/01-design/iteration1-task-breakdown.md，git HEAD=182c4d4 已推送，md5=9f6cb2fccd8a1a552cc6062bc5d7afe4。要点：v2.0；T01T27约92人日；契约先行；阶段0契约脚手架(T01/T02)→1主数据底座(T03T09)→2审批引擎(T10T12)→3入转调离合同(T13T19)→4编制/报表/收尾(T20~T27)；依赖/估时/验收对照；T27集成验收标准（90条全过/P0 100%/降级项专项/性能抽测/权限脱敏抽测））