Pin the target before the first await

// before: reads whatever agent is open *now*, after each await
for (const batch of batches) await apply(currentAgent(), batch);

// after: pin the target once, and tell "nothing to do" apart from "failed"
const target = currentAgent();
for (const batch of batches) {
  const r = await apply(target, batch);   // { ok: true, value } | { ok: false }
  if (!r.ok) break;                       // a no-op keeps going
}