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Consolidate four separate PR labeling workflows (`pr_labeler_file.yml`, `pr_labeler_title.yml`, `pr_size_labeler.yml`, and the PR-handling half of `tag-external-contributions.yml`) into a single `pr_labeler.yml` workflow. The old workflows raced against each other — concurrent label mutations could drop or duplicate labels depending on execution order. A unified workflow with concurrency grouping eliminates that class of bug.