Wrap the version-directory scan in try/catch so a transient FS error
(permission denial, an AV file lock on Windows, a directory vanishing
mid-scan) fails closed to null instead of throwing — matching the
original callers' contract, and safer across the Windows/macOS/Linux
CI matrix where these error modes differ.
Also drop the redundant USERPROFILE/HOME manual chain in
extension-binary-real.test.ts in favor of the repo's established
os.homedir() convention (already used ~15 other places here), which
Node resolves correctly per-OS and already honors env overrides.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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