Function image_body 

pub fn image_body(
    model: &str,
    mime: &str,
    png: &[u8],
    prompt: &str,
    max_tokens: usize,
) -> Value

2026-09-26: One request carrying a single image: with text_array_body, the two baselines the pad-arithmetic cell subtracts.

Both send content as an array, like video_body and mixed_body, so every term of the arithmetic goes through the same content shape. text_only_body sends a plain string and is not used as a baseline.