docs: audit package limitations on current stack
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@@ -9,3 +9,10 @@ Policy rides the call, not the provider: two consumers may confine under differe
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**Same-world confinement only.** A backend shares the host's filesystem and kernel (`bwrap`, Landlock, Seatbelt); `workspaceRoot` names a real host path. Containers, microVMs, and remote executors are NOT backends of this seam — they replace whole capability implementations (`ctx.bash`, `ctx.fs`) as environment-coherent groups. The boundary and its rationale: [the sandbox RFC](../../../docs/rfc/implemented/feature/2026-07-06-sandbox.md).
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Implementations: [`@deepseek-ai/dsh-sandbox-local`](../sandbox-local/) (Linux: `bwrap`, else the per-platform Landlock launcher; macOS: `sandbox-exec`/Seatbelt). Consumers: [`@deepseek-ai/dsh-bash-sandbox`](../../bash/bash-sandbox/) (wraps `['bash', '-c', command]`).
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## Known Limitations and Deferred Work
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- **File effects are the whole policy vocabulary** — the seam expresses no network, process, syscall, device, or credential restrictions.
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- **Same-world confinement only** — containers, microVMs, and remote execution require replacing capability implementations rather than adding a provider here.
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- **Denial reporting is a stderr dialect** — the seam returns backend signatures instead of a typed runtime denial channel, so consumers that need classification must infer it from the child process's output.
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- **One provider per context** — composing different sandbox mechanisms simultaneously requires a provider-level ladder or separate Cordis contexts; callers choose policy per call, not backend identity.
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