Function run_verify_command 

pub fn run_verify_command(
    verify_cmd: &str,
    working_dir: &Path,
    timeout_secs: Option<u64>,
) -> Result<VerifyResult, Error>

Execute a verify command in the given directory with an optional timeout.

This is the low-level execution function — no unit loading, no config resolution. Useful when the caller already has the command and timeout.