P2: auto-pr.yml 增加 retry helper

[Cho-Geer]

Parent Epic

#125 — GitHub Issue↔PR Auto-Linking Implementation

改动

.github/workflows/auto-pr.yml:

• 增加 retry wrapper 处理 gh pr create 临时故障
• 匹配 doc-decompose.yml:209 的 retry 模式

参考

docs/review/gh-workflow/issue-pr-auto-link-solution.md §6

[Cho-Geer]

Parent Issue

#125 — GitHub Issue↔PR Auto-Linking Implementation

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This issue is a sub-task of Epic #125.