feat: enable lazy barrel by default

[ahabhgk]

Summary

Enable lazy barrel by default for v1.6

Related links

Checklist

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

[netlify]

✅ Deploy Preview for rspack ready!

Name	Link
🔨 Latest commit	53d9173
🔍 Latest deploy log	https://app.netlify.com/projects/rspack/deploys/68ea09d4a0f9200008d86b26
😎 Deploy Preview	https://deploy-preview-11841--rspack.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 enables the lazy barrel experimental feature by default starting from version 1.6.0. The lazy barrel feature optimizes build performance by skipping the building of unused re-export modules in side-effect-free barrel files.

• Changed the default value of experiments.lazyBarrel from false to true in the core configuration
• Updated documentation to reflect the new default value and version information
• Removed explicit lazyBarrel: true settings from test configurations since it's now the default

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/rspack/src/config/defaults.ts	Updates the default value of experiments.lazyBarrel from false to true
tests/rspack-test/defaultsCases/default/base.js	Updates test expectation to reflect the new default value
website/docs/zh/config/experiments.mdx	Updates Chinese documentation with new default value and version note
website/docs/en/config/experiments.mdx	Updates English documentation with new default value and version note
packages/rspack-test-tools/src/case/*.ts	Removes explicit lazyBarrel: true from test configurations (8 files)

---

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

[github-actions]

📦 Binary Size-limit

Comparing 53d9173 to refactor: output.charset false by default (#11837) by Fy

🙈 Size remains the same at 47.89MB

[codspeed-hq]

CodSpeed Performance Report

Merging #11841 will not alter performance

_{Comparing enable-lazy-barrel-by-default (53d9173) with main (5349110)}

Summary

✅ 17 untouched