Implement python sandbox in docker

[AaLexUser]

Implement the save_python_sandbox use case with a Docker adapter, following TDD and hexagonal architecture principles.

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[cursor]

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[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch cursor/implement-python-sandbox-in-docker-3e4f

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