Tests familiarity with Node's built-in modules for interacting with the host system.
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osmodulesperformance
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Size workers to cores; portable temp path
import os from 'node:os';
import path from 'node:path';
const workers = os.availableParallelism?.() ?? os.cpus().length; // cgroup-aware
console.log(`spawning ${workers} workers on ${os.platform()}/${os.arch()}`);
const tmpFile = path.join(os.tmpdir(), 'upload.tmp'); // portable, not '/tmp'05
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