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The `peter-evans/enable-pull-request-automerge@v3` action requires branch protection rules on the target branch. Without them, the GitHub GraphQL API rejects with "Pull request is in clean status". Replace with `gh pr merge --squash --delete-branch` which merges the PR immediately after creation without requiring branch protection rules, and automatically cleans up the temporary branch. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>