fix(ci): 恢复稳定的 "Dogfood Regression Gate" 必需检查名 — 全仓 PR 死锁修复 - #3644
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…name (#3622 follow-up) INCIDENT: every open PR in the repo is BLOCKED — mergeable, all checks green, merge button dead. Root cause: #3622 sharded the dogfood job 2-way, so its checks now publish as "Dogfood Regression Gate (1/2)" / "(2/2)". Branch protection still requires the bare context "Dogfood Regression Gate", which no job emits anymore — the requirement can never be satisfied. #3622's own comment called for updating branch protection; that step never happened. Fix keeps the contract in CODE rather than in protection settings: a tiny aggregator job carrying the stable name, gated on the matrix's aggregate result. A future shard-count change therefore cannot deadlock the repo again. `if: always()` + result inspection so a legitimately skipped matrix (filter says no core paths changed) still satisfies the gate. Verified: workflow YAML parses; job graph has dogfood-gate needs: dogfood with name "Dogfood Regression Gate". Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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事故：全仓所有开放 PR 卡死
复现：任取一个开放 PR，
mergeable: MERGEABLE、所有 check 绿、mergeStateStatus: BLOCKED，合并按钮不可用（实测 #3637/#3638/#3639/#3640/#3401 全中）。根因：#3622 把 dogfood job 分片成 2 路矩阵，check 名变为
Dogfood Regression Gate (1/2)/(2/2)；而分支保护要求的是裸名Dogfood Regression Gate——现在没有任何 job 产出这个名字，该必需项永远无法满足。#3622 自己的注释写了"若分支保护要求该名，必须更新为两个分片名"，但那步没有执行。修法：契约留在代码里，不动保护设置
新增一个极小的聚合 job 承载稳定名
Dogfood Regression Gate，needs: dogfood，按矩阵聚合结果判定：success/skipped（filter 判定未触及 core 路径时矩阵合法跳过）→ 通过；好处：将来再改分片数不会二次死锁（不必每次同步改保护设置），且无需管理员改仓库配置。
合并说明
本 PR 修的正是"阻止一切合并"的那个门，存在鸡生蛋问题——需以管理员权限合入一次，此后所有 PR（含本 PR 之后的）恢复正常合并。
🤖 Generated with Claude Code