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_commit_workflow_file() renames a prior workflow.yml aside to workflow.yml.bak so it can be restored if registry.add() subsequently fails. Neither the local install/reinstall path nor the catalog install/reinstall path ever cleaned up that backup after a successful registry.add() -- every successful reinstall permanently left a workflow.yml.bak sibling, which later reinstalls would silently overwrite/re-orphan. Add a shared _discard_committed_backup_file() helper, called from both success paths right after registry.add() durably succeeds (and before the final "installed" message, preserving output ordering). A fresh install (backup_file is None) is a no-op. A cleanup failure is reported as a warning (exit 0), not a failure, since the install itself already succeeded -- consistent with workflow_remove's post-commit cleanup warning semantics. Add red-first regression tests proving: (1) successful local reinstall leaves no workflow.yml.bak sibling, (2) successful catalog reinstall leaves no workflow.yml.bak sibling, (3) a cleanup failure on the backup file after a successful reinstall reports a warning and still exits 0 with the registry correctly reflecting the new install. Assisted-by: GitHub Copilot (model: Claude Sonnet 5, autonomous) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>