chore: replace glob with native node:fs globSync

[roli-lpci]

Summary

• Replace glob package usage with native node:fs globSync in scripts/validate.cjs and packages/core/test/io/node-io.test.ts
• Modernize require('fs') / require('path') to require('node:fs') / require('node:path') in the validate script

The glob package was never listed as a direct dependency — it was accessed via hoisting from transitive dependencies. Native fs.globSync (available since Node.js 22) provides the same functionality with zero external dependencies, and CI already tests on Node.js v22+.

Closes #1800

[donmccurdy]

Thanks @roli-lpci! For the uses that were previously async — could you use import {glob} from 'node:fs/promises'; instead?

[roli-lpci]

Good call — I'll update the async paths to use import { glob } from 'node:fs/promises' instead. Let me check the minimum Node version to make sure fs.promises.glob is available (it landed in Node 22).

What's the project's minimum supported Node version? If it's >= 22, I'll switch to the native async glob. If < 22, I could use fs.promises.readdir with { recursive: true } and filter by extension as a fallback.

[donmccurdy]

Hm, I'm getting the impression that this change is part of an experiment in generating many PRs, in bulk, with an LLM. I'd prefer that my projects not be included in these experiments. Thank you.