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_stage_workflow_file() does dest_dir.mkdir(parents=True, exist_ok=True) then tempfile.mkstemp(dir=dest_dir, ...). For a fresh install (no prior directory), if mkdir succeeds but mkstemp then raises (disk full/EMFILE/quota), the exception previously propagated straight past both the local-install and catalog-install call sites without any cleanup, leaving the newly-created empty workflow directory orphaned on disk with no error indicating why. Fix at the shared _stage_workflow_file() boundary instead of duplicating cleanup at each call site: track whether this call created dest_dir: on a mkstemp failure, remove that directory via a guarded rmdir (never a broad rmtree, so any concurrently written content would be left untouched) before re-raising the original OSError unchanged. A pre-existing (reinstall) dest_dir is never touched by this cleanup, and a cleanup failure is reported as its own warning without masking the original error. Add red-first regression tests proving: a fresh local install (--dev, plain local path, --from) and a fresh catalog install both clean up the orphaned directory on a simulated mkstemp failure, and a reinstall over a pre-existing directory is left untouched by the same failure. Assisted-by: GitHub Copilot (model: Claude Sonnet 5, autonomous) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>