Function extract_output_format 

pub fn extract_output_format(
    args: &[impl AsRef<str>],
    default_format: &str,
) -> String

Extracts output format from raw args.

Recognizes --output <format> / -o <format> / --output=<format>, plus --json, --toon, and --human as shorthand for their respective formats. Falls back to default_format when none is present.