dragon_status() reads the run's state. dragon_progress() returns one
row per logged step. dragon_logs() returns the tail of the trainer log.
Value
dragon_status(): a list with at least state, one of
"queued", "running", "succeeded", "failed", "cancelled".
dragon_progress(): a data frame with columns step, epoch,
loss, eval_loss, lr, grad_norm, elapsed_s, eta_s, and for
preference runs pref_acc, reward_margin, eval_pref_acc,
eval_reward_margin.
dragon_logs(): a character vector.