Add a new -A sandbox command-line option that sets a flag to assume no
terminal is present. This causes serial_query_size() to return -ENOENT
immediately, similar to when CONFIG_SERIAL_TERM_PRESENT is disabled.
This option is useful for testing pager behavior in non-interactive
environments without needing to modify configuration options.
Co-developed-by: Claude <noreply@anthropic.com>
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