pub fn persisted_line(json_str: &str) -> Cow<'_, str>Expand description
The form of a Claude stdin line that AgentMux stores for replay: image
blocks dropped and the content collapsed back to its text, which still
holds the <attached_images> list. Every reader of stored user lines
expects content to be a string, and a stored line should never carry
megabytes of base64. Lines without an array content pass through.