Function version_changed_frame 

pub fn version_changed_frame(
    provider: &str,
    from: &str,
    to: &str,
    pinned: Option<&str>,
) -> Value

An agentmux_cli_version_changed frame. pinned is the version this AgentMux build installs, so the pane can say when to isn’t it (a self-update, or a stale install).