refactor(runway): remove head-branch updates from the git merger - #723
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sbalabanov
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Sep 17, 2026
The git merger no longer moves a change's head branch to its landed commit after a REBASE or SQUASH_REBASE step lands. The `updateHeadBranch` merge-config field and the `MERGE_UPDATE_HEAD_BRANCH` env var are removed along with the mechanism, metrics, docs, and tests. Head-branch finalization (marking a rewritten change's pull request merged) is to be handled by SubmitQueue in a later, separate change. Co-Authored-By: Claude Fable 5.1 <runway@submitqueue.invalid>
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Removes the git merger's head-branch update mechanism entirely: it no longer moves a change's head branch to its landed commit after a REBASE or SQUASH_REBASE step, and the
updateHeadBranchmerge-config key /MERGE_UPDATE_HEAD_BRANCHenv var are gone along with it. The staleness check is untouched. Head-branch finalization is to be handled by SubmitQueue in a later, separate change.🤖 Generated with Claude Code