WIP: Add Kubernetes sandbox runtime - #211
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Summary
KubernetesSandboxBackendbehind the existing provider-neutral sandbox contractKubernetesSandboxinstance with exec, file transfer, resource policy, and cleanupCLEARWING_SANDBOX_BACKEND=kubernetesand a deployment-managedCLEARWING_SANDBOX_IMAGEVerification
uv run pytest tests/test_sandbox_backends.py tests/test_kubernetes_sandbox.py tests/test_sandbox_container.py tests/test_sandbox_writable_workspace.py -q(65 passed)uv run ruff check clearwing/sandbox/backend.py clearwing/sandbox/__init__.py clearwing/sandbox/kubernetes.py tests/test_kubernetes_sandbox.pyuv run mypy --follow-imports=skip clearwing/sandbox/kubernetes.pyWIP notes
This intentionally uses a pre-built, deployment-managed sandbox image. On-cluster image building and live-cluster integration coverage are follow-up decisions before marking ready.
Conflict scan
PR #200 already merged the sandbox backend contracts used here. No active PR currently models a competing Kubernetes sandbox backend or lifecycle.