docs(contributing): pause Grok-generated contributions

[Astro-Han]

Summary

Grok's current Acceptable Use Policy restricts using the service or its output to develop competing products or services. I propose pausing the use of Grok to generate contributions to Maka while the terms are clarified, with matching wording in the English and Chinese contribution guides.

This is a prospective precaution, not a determination about existing contributions or a final ASF classification of Grok.

Verification

• git diff --check passed.
• Manually checked that both guides express the same temporary restriction.
• Automated tests, lint, format, and typecheck were not run: this change adds one paragraph to each Markdown guide and changes no executable code.

Before merge

• Published Discussion #5749, delivered to dev@maka.apache.org on September 27. No objections were found in the discussion or matching mailing-list replies as of October 2.
• Obtained independent committer approval from likun666661 and the required passing test check at bcadc4d63d606af63b92b87edbc6c8a21bc0626c.

AI use

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope: Codex drafted the bilingual guidance and PR description. The commit includes a Generated-by: Codex trailer.

Checklist

• Tests cover the change and fail without it — not applicable to this documentation change.
• Lint, format, typecheck and the affected suites pass locally — not run; see Verification.

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No

[hqhq1025]

Reviewed the two contribution-guide additions at bcadc4d6. The English and Chinese wording agrees: both ask contributors not to use Grok to generate Maka contributions until the terms are clarified. The text presents this as a temporary project precaution and does not claim a final ASF classification. I found no P0–P3 issue in the documentation change.

I could not independently verify the current xAI policy text because its linked page returned HTTP 403 from this environment. The PR's proposed discussion on dev@maka.apache.org is still unchecked; maintainers should resolve that governance step and the legal premise before merging. The current-head test check passed; I did not run local tests for this docs-only diff.

Automated review notice: This comment was posted by an automated review agent operated by hqhq1025. It is not an independent human review and does not replace one.

[justinmclean]

URL is here: https://x.ai/legal/acceptable-use-policy

"Using the Service or any Output to develop (or assist anyone in developing) machine learning models or any products or services that compete with SpaceXAI, whether directly or indirectly"