Batch inference resume

<?php
require 'examples/boot.php';
require __DIR__.'/../Support/DemoBatch.php';

use Examples\BatchInference\Support\DemoBatch;

$submitted = DemoBatch::client()->submit(DemoBatch::items());
$worker = __DIR__.'/resume.php';
$process = proc_open([PHP_BINARY, $worker], [
    0 => ['pipe', 'r'], 1 => ['pipe', 'w'], 2 => ['pipe', 'w'],
], $pipes);
if ($process === false) {
    throw new RuntimeException('Could not start batch resume worker.');
}
fwrite($pipes[0], json_encode($submitted->reference()->toArray(), JSON_THROW_ON_ERROR));
fclose($pipes[0]);
$output = stream_get_contents($pipes[1]);
$error = stream_get_contents($pipes[2]);
fclose($pipes[1]);
fclose($pipes[2]);
if (proc_close($process) !== 0) {
    throw new RuntimeException('Batch resume worker failed: '.$error);
}
$result = json_decode($output, true, flags: JSON_THROW_ON_ERROR);
if ($result['status'] !== 'completed' || $result['keys'] !== ['row-1', 'row-2']) {
    throw new RuntimeException('Batch reference did not survive process restart.');
}
echo "Resumed {$result['id']} with two keyed outcomes\n";
?>