Update VGI-Bench authors and official resources

[reacher-z]

Summary

Update the existing VGI-Bench entry rather than adding a duplicate:

• Add Jize Jiang between Yuhao Wen and Zeyi Liu, matching the 23-author list in arXiv v3 and the official project BibTeX.
• Link the official project page and code repository, so readers can reach the benchmark resources and evaluation instructions from the list.
• Preserve the August 2026 placement and existing title/author/resource-line format. No new venue label, result claim, or contributor marker is added.

Verification

• Read README contribution guidance and all six historical issue/PR records; none proposes this resource update.
• Paper, project, and code links all resolve with HTTP 200. The project page links the same code repository, and the repository contains data instructions and evaluation code.
• Exactly one VGI-Bench entry remains. Author order was compared with the current paper and project page.
• Only README.md changes; the existing Pages workflow copies it into docs before building, so no generated duplicate is committed.
• git -c core.whitespace=-blank-at-eol diff --check passes. The author line intentionally retains the two trailing spaces used throughout this README for Markdown hard line breaks; plain git diff --check flags that existing formatting convention.

Disclosure: I am a coauthor. This contribution was prepared with AI assistance.