Note jev-codex-router upstream archive status

[AsafMazuz1]

Pull request

What changes and why?

Focused correction to the just-merged jev-codex-router guide: the upstream GitHub repository is archived (still MIT-readable). Disclose that in Format, When to use, and Review sections so readers do not expect active upstream maintenance.

Canonical URL unchanged: https://github.com/0xNatoshi/jev-codex-router

Verification

Confirmed archived: true via GitHub API on 2026-09-20. No other listing changes.

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Checklist

• I read the repository's CONTRIBUTING.md.
• This change adds one resource or makes a focused correction.
• For a community project, its detail page, category index entry, and README links are complete and consistent (or not applicable).
• Links work and descriptions are factual; prerequisites and limitations are clear.
• I ran the applicable checks and included no secrets or private data. (catalog check via PR offline CI)