docs: correct NU1608 behavior

[thomhurst]

Summary

• describe NU1608 accurately as a warning that does not block restore
• show consumers how to promote NU1608 to an error
• correct the historical changelog claim

Closes #432

Validation

• pwsh scripts/Verify-Docs.ps1
• pwsh scripts/Verify-Changelog.ps1
• npm ci and npm run build in docs/

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[chatgpt-codex-connector]

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