Function is_image_note 

pub fn is_image_note(text: &str) -> bool

Whether text is the harness’s own line about an image it just read.

The CLI sends it as the reader’s own row right after the result that carried the image; the client fold hangs it on the call that read the picture (imageNoteOf in its units.ts), so it belongs in that call’s turn rather than in one of its own.