CLI path normalization resolved every nonblank selected string against
the working directory, so executable_path "file:///opt/electron" became
an invented local path and failed with ENOENT for that location instead
of the field's local-path requirement. Leave `file:` and `scheme://`
references unchanged so the shared schema rejects them as non-local
paths. One-letter prefixes stay paths, so Windows drive paths and
relative names containing a colon resolve as before.
Fixes#2577
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>