- workflow add's plain local-path fallback (no --dev) checked wf_file.exists()
before installing, so a directory literally named workflow.yml passed the
guard and _validate_and_install_local() leaked an uncaught
IsADirectoryError instead of the documented CLI error. Use is_file(),
matching the --dev branch's existing guard.
- WorkflowRegistry._load() treated any OSError while reading an existing
registry the same as corrupted JSON, resetting to an empty in-memory
registry. A later save() would then silently persist that empty state via
os.replace, discarding every previously installed workflow entry. Track a
_load_error flag on OSError-during-read and have save() refuse to write
when it is set, so a transient I/O failure can no longer overwrite intact
data on disk.
- docs/reference/workflows.md: document `--from <url>` with its value
placeholder, matching extensions.md and presets.md.
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