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fb64ddd48c
_install_workflow_from_catalog's final registry.add() failure handler unconditionally rmtree'd workflow_dir. That's safe for a brand-new install, but plain `workflow add <catalog-id>` also allows re-adding an already-installed workflow, downloading the new version over the existing directory first. If registry.add() then failed to save, the unconditional rmtree deleted the prior working install while the registry (after its own rollback) still reported it installed -- data loss with no way back. workflow_update already avoids this via an outer backup/restore around this function, but plain add has no such caller. Fix mirrors _validate_and_install_local's existed-before/backup-aware handling: capture whether workflow_dir existed and back up its workflow.yml bytes before any download write, then on a registry.add() OSError, restore those bytes for a reinstall or rmtree only a brand-new directory. Only one file (workflow.yml) is ever written by this path, so no further per-file bookkeeping is needed. Added a failing-first regression: install a catalog workflow, re-add it with a simulated registry save OSError, and assert a clean error, the original workflow.yml restored byte-for-byte, and the registry still reporting the original version installed. Confirmed red (prior file deleted) before the fix, green after. Assisted-by: GitHub Copilot (model: Claude Sonnet 5, autonomous) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>