docs: document maintainers and review ownership

[OnlineChef]

Summary

Exposes the remaining work on agent/document-maintainers as a reviewable pull request against main.

Branch state

• 1 commit ahead of main
• 9 commits behind main
• Created during branch-to-PR cleanup

Review notes

This branch should be reviewed and updated against the current main before merge. No automatic merge is enabled.

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Greptile Summary

This PR documents project maintainers and review ownership. The main changes are:

• Adds .github/CODEOWNERS with default and sensitive-path reviewers.
• Adds MAINTAINERS.md with maintainer roles, merge policy, maintainer-change process, and security report routing.
• Links the maintainer policy from the root contributing guide and public docs.
• Records governance invariants and rationale in structure/06_docs-and-release.md.

Confidence Score: 5/5

Safe to merge from the reviewed documentation and CODEOWNERS changes.

The changes are limited to documentation and GitHub review-owner metadata, with no runtime behavior changes or accepted issues.

No files require special attention.

T-Rex Logs

What T-Rex did

• Validated the build completed successfully with 121 pages built and EXIT_CODE: 0.
• Verified the preview/browser validation finished successfully with EXIT_CODE: 0.
• Confirmed the URL/text note recorded HTTP 200, page title, URL visited, and visible text as verified.
• Captured a screenshot of the real Starlight contributing page UI for review.

_{Ran code and verified through T-Rex}

Important Files Changed

Filename	Overview
.github/CODEOWNERS	Adds repository-wide and sensitive-path review ownership for the listed maintainers.
MAINTAINERS.md	Introduces maintainer roster, review and merge policy, maintainer-change process, and security-report routing.
docs-site/src/content/docs/contributing.md	Adds a public docs section pointing contributors to maintainer policy and CODEOWNERS review routing.
CONTRIBUTING.md	Links the root contributing entrypoint to the new maintainer roles and merge policy document.
structure/06_docs-and-release.md	Documents governance invariants and the rationale for treating CODEOWNERS as review routing rather than permission authority.

_{Reviews (1): Last reviewed commit: "docs: document maintainers and review ow..." | Re-trigger Greptile}

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: e517d8c5-f1ab-4fcd-b902-cc59f8362cd6

📥 Commits

Reviewing files that changed from the base of the PR and between b6f4733 and 830aae0.

📒 Files selected for processing (5)

• .github/CODEOWNERS
• CONTRIBUTING.md
• MAINTAINERS.md
• docs-site/src/content/docs/contributing.md
• structure/06_docs-and-release.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/document-maintainers

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