promptFile property
--prompt-file <path> (alias -f): read the file as UTF-8 text and
send it verbatim as the headless prompt — never further resolved.
Mutually exclusive with prompt and positionals. The path is
resolved by the executable's IO layer; a missing/unreadable file is a
usage error (CliArgsException from resolveHeadlessPrompt).
Implementation
final String? promptFile;