Function push_gotify_notification_into_chat 

pub(crate) fn push_gotify_notification_into_chat(
    workspace: &Workspace,
    target_key: &SessionSlot,
    notification: &GotifyNotification,
    uuid: &str,
)

Emit a typed GotifyNotificationAppended so the target session’s chat buffer shows the inbound notification block. Mirrors push_peer_user_turn_into_chat - the target’s claude subprocess still receives the prose via a separate Command::Prompt dispatch; this only drives the visible chat echo.