fix(ci): correct gitlink detection in submodule gate and pr governance - #9
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Drill D5 exposed that a real SHA-bump PR reported not-applicable: git diff --raw headers are ':oldmode newmode oldsha newsha status', so awk $4 tested the new SHA instead of the mode, and the Python parser checked cols[2] (old SHA) against '160000' while extracting cols[3]/cols[4] (status letter). Match mode at cols[1] and take SHAs from cols[2]/cols[3].
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演练发现的真实缺陷（M4 观察期产出）
D5 演练（PR #8，真实 SHA-bump）暴露：Submodule Gate 报告 not-applicable，
而该 PR 明确包含 bt_api_ctp 的 gitlink 变更。
根因（本地已复现）
git diff --raw头部格式为:oldmode newmode oldsha newsha status：awk '$4 ~ /160000/'测试的是新 SHA 字段而非 mode → count 恒为 0cols[2] == "160000"检查的是旧 SHA；old/new 提取索引错位（取到 status）修复
按真实字段位置匹配
cols[1] == "160000"/awk '$2 == "160000"'，SHA 取 cols[2]/cols[3]。验证
git diff --raw f338199b..24ad0762 | awk '$2 == "160000"' | wc -l→ 1（修复前为 0）risk:r1 — 仅 CI 检测逻辑；area:ci。