Serialize OpenAI Agents sandbox operations

[aniketmaurya]

Summary

• serialize command and file operations inside OpenAI Agents sandbox sessions
• avoid concurrent SmolVM SSH/SFTP calls during manifest setup\n- update the SmolVM install hint to the current OpenAI Agents extra\n\n## Validation
• uv run ruff check src/celesto/integrations tests/test_openai_agents_integration.py\n- uv run pytest tests/test_sdk.py tests/test_openai_agents_integration.py\n- ran uv run python examples/openai-agents-sdk/harness_outside_sandbox.py; setup reached the model call and stopped because OPENAI_API_KEY is not set in this shell

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b8bbb3e3-96ef-4faa-ae57-b1711b2a5cfe

📥 Commits

Reviewing files that changed from the base of the PR and between e17c1b4 and dab143f.

📒 Files selected for processing (2)

• src/celesto/integrations/openai_agents/hosted.py
• src/celesto/integrations/openai_agents/smolvm.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-openai-agents-sandbox-serialization

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