docs: remove beta tag from sandbox agents docs

[seratch]

This pull request removes beta tag from sandbox agents documentation.

[changeset-bot]

🦋 Changeset detected

Latest commit: 520be4a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@openai/agents	Patch
@openai/agents-core	Patch
@openai/agents-extensions	Patch
@openai/agents-openai	Patch
@openai/agents-realtime	Patch

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-24T18:01:20.639596Z	520be4a	PR opened
🔒 Security Review	✅ Completed 2026-09-24T18:01:02.042949Z	520be4a	PR opened

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Reviewed commit: 520be4adfa

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[markstuart-oai]

Reviewed 520be4adfa18b004113175839fbce0a7e10460aa. The READMEs and English/localized sandbox guides consistently remove the beta label, and the now-unused Aside imports are removed. Links, anchors, example imports and security guidance are preserved. The focused patch changeset matches the package documentation change. No blocking correctness or maintainability findings.

Verified successful docs-build and changeset-validation checks on this exact head. This was a source-only review; I did not run a local docs build or tests.