ci: fix migration-policy false positives from shallow base fetch - #12
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The policy.yml checkout already fetches full history, but this script then re-fetched the base ref with --depth=1. A shallow base ref grafts away its ancestry, so origin/BASE..HEAD stopped excluding the base tip's ancestors; on a PR branch that merged the base in (Update branch) historical base commits reappeared in the range and tripped the commit-metadata rule. Fetch the base full-depth and scope the scan to merge-base(BASE,HEAD)..HEAD. No change to what the policy forbids.
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Propagates the fix already merged in librtbit-upnp-serve (#4). The script re-fetched the base ref
--depth=1despite the workflow checking out full history; the shallow graft madeorigin/BASE..HEADreappear historical base commits after an Update-branch merge, tripping the commit-metadata rule on commits the PR never touched. Fix: fetch base full-depth + scope tomerge-base(BASE,HEAD)..HEAD. No change to what the policy forbids.