Midjourney task integration

export API_MJ_TASK_ID="YOUR_MJ_TASK_ID"
node examples/midjourney-status.mjs

import { requestJSON } from './http-client.mjs';

try {
  const id = process.env.API_MJ_TASK_ID;
  if (!/^[A-Za-z0-9_-][A-Za-z0-9._~-]{0,127}$/.test(id || '')) throw new Error('Set API_MJ_TASK_ID.');
  const result = await requestJSON(`/mj/task/${encodeURIComponent(id)}/fetch`);
  if ('code' in result || result.id !== id
    || !['', 'NOT_START', 'SUBMITTED', 'IN_PROGRESS', 'SUCCESS', 'FAILURE'].includes(result.status)) {
    throw new Error('Invalid task or business error.');
  }
  // Query once; SUCCESS describes task state, not a downloaded or verified image.
  console.log(JSON.stringify({ id, status: result.status || 'PENDING', completed: result.status === 'SUCCESS' }));
} catch {
  console.error('Midjourney status request failed. No automatic submission or retry.');
  process.exitCode = 1;
}