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7b8c3a9b40
ctx.sandbox (dsh-sandbox): confine(argv, policy) returns the argv to spawn instead — wrapped so the process and its children run confined — plus the enforcement completeness and the backend denial/runner-failure dialects; no usable backend throws the fail-closed SANDBOX_UNAVAILABLE. Policy rides per call. dsh-sandbox-local selects by platform and caches the verdict: multi-candidate chains probe FUNCTIONALLY in preference order (Linux: bwrap → the registry-installed node-addon-landlock-run launcher), a sole candidate is selected unprobed (darwin: sandbox-exec/Seatbelt) and fails closed at execution via runnerFailureSignatures; win32 is a reserved empty chain. Profile parity is honest per backend (documented temp-area and ABI differences; enforcement full|partial is a structured result fact). CI: the sandbox-e2e matrix proves real-kernel confinement per rung (bwrap, Landlock per architecture through the registry-installed launcher, Seatbelt), failing on a silent all-skip; the packed-install rehearsal installs the launcher family from the registry and asserts the binary executable apart from kernel enforcement.