fix: drift-check §8 jq 正则转义

[randypanding]

C3 修复：jq 程序位于单引号内，$ 无需转义。.github 已被 main-protection 覆盖，本 PR 为首个需 gate 真实变绿才可合并的 PR——终验整条管控链。

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Reviewing files that changed from the base of the PR and between e7e8db0 and 38e4d43.

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• governance/drift-check.sh

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