feat: add sandbox agent packaging — Dockerfile, pyproject, config#184

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Ladas wants to merge 6 commits intomainfrom

feat/sandbox-a3-config

Commits on Mar 20, 2026

feat(sandbox): Dockerfile with system tools, uv package manager, and non-root agent user
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docs(sandbox): add sandbox agent README
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feat(sandbox): pyproject.toml with a2a-sdk, langgraph, langchain, and otel dependencies
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feat(sandbox): settings.json with deny/allow/HITL permission rules for sandboxed operations
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feat(sandbox): sources.json declaring available package managers, registries, and runtime limits
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feat(sandbox): uv.lock pinning all resolved dependency versions
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