P4: Evaluate ProjectV2 as source of truth

[Cho-Geer]

Parent Epic

#125 — GitHub Issue↔PR Auto-Linking Implementation

评估范围

• 当前 Tier 1 (Closes keyword) + Tier 2.4 (ProjectV2) 分工是否合理
• Projects board 成为唯一数据源的可行性
• 是否需要替换 Tier 1 Closes keyword

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.