chore: use tinypool workerId as RSTEST_WORKER_ID

[9aoy]

Summary

use tinypool's workerId as RSTEST_WORKER_ID.

Related Links

https://github.com/tinylibs/tinypool?tab=readme-ov-file#exports

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for rstest-dev ready!

Name	Link
🔨 Latest commit	7bc7fa6
🔍 Latest deploy log	https://app.netlify.com/projects/rstest-dev/deploys/68f9d092e2280c0008644667
😎 Deploy Preview	https://deploy-preview-642--rstest-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[Copilot]

Pull Request Overview

This PR changes the worker identification mechanism to use tinypool's native workerId instead of a custom counter, improving alignment with the underlying worker pool implementation.

Key Changes:

• Renamed workerId to taskId in WorkerContext to reflect its actual purpose as a task identifier
• Updated RSTEST_WORKER_ID environment variable to use tinypool's workerId when available, falling back to taskId

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/core/src/types/worker.ts	Renamed workerId field to taskId in WorkerContext type definition
packages/core/src/runtime/worker/index.ts	Updated environment variable assignment to prefer tinypool's workerId with taskId fallback
packages/core/src/pool/index.ts	Updated two call sites to use taskId property name instead of workerId

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Smrtnyk]

vitest got rid of tinypool in v4, due to some bugs they couldn't solve because of it

[9aoy]

vitest got rid of tinypool in v4, due to some bugs they couldn't solve because of it

In the future, Rstest may have its own pool implementation. For now, let's continue using it.