Electron and process scenario path admission caught every realpath or
stat failure as an invalid_value input issue, so a correct path beneath a
directory without search permission returned invalid_request with
schema-correction recovery instead of a host access denial.
Admission now classifies EACCES/EPERM from path resolution and metadata
reads as the existing AnalysisAccessDeniedError (selected path,
system_code, filesystem-read boundary). Missing, looping or otherwise
unresolvable paths and reachable files without execute permission keep
their input-error semantics. Electron reports invalid selections before a
denial on another field. Process PATH search still continues past a
denied directory; only an explicitly selected executable reports denial.
Fixes#6117
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
