docs(structure): keep providers-and-adapters.md within its 600-line budget

[lidge-jun]

Summary

Five PRs merged into dev today each added text to structure/providers-and-adapters.md. Each fit the 600-line budget on its own, but together they left the file at 601 lines, so bun run structure:check (and the Cross-platform structure gate) fails on dev. This joins the new-arrival sentence added by #6331 onto the preceding line in the same paragraph, bringing the file back to 600 lines with no wording change.

Verification

• bun run structure:check: "structure/ SSOT checks passed" (it failed with the 601-line budget error on dev f9bfca0).
• wc -l structure/providers-and-adapters.md: 600.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

[github-actions]

✅ Deterministic PR hygiene checks passed.

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Reviewing files that changed from the base of the PR and between f9bfca0 and 9111e4f.

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• structure/providers-and-adapters.md

 ____________________________________________
< `undefined` is not a business requirement. >
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  \
   \   (\__/)
       (•ㅅ•)
       / 　 づ

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[lidge-jun]

Maintainer integration into dev by @lidge-jun: fixes the union overflow of the structure doc budget introduced by today's landing batch. bun run structure:check passes locally at this head; Cross-platform CI runs once on the final dev tip.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-30T15:09:12.008417Z	9111e4f	PR opened

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