When BranchPushedToRemote fails to use the tracking ref (e.g., due to
missing remote.origin.fetch config in worktrees), fall back to using
git ls-remote to get the remote SHA directly and compare.
This makes gt done more resilient in worktrees where the fetch refspec
may be incomplete or missing.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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