feat(w8): macOS SeatbeltBackend process sandbox - #62
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Ship OS-enforced process isolation for ShellTool via sandbox-exec: workspace RW + network denied by default; outside-jail reads and outbound network fail closed. Feature-gated (`seatbelt`); Shell e2e proves sandboxed() path end-to-end on macOS.
Seatbelt e2e only compiles on macOS; tempfile as a sandbox dev-dep trips unused-crate-dependencies under CI --all-features on Linux.
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Summary
machi-sandbox, featureseatbelt, macOS): wraps commands with/usr/bin/sandbox-exec; SBPL fromSandboxPolicy(workspace RW, net denied by default).wrapprefixessandbox-exec.ShellTool::sandboxed(SeatbeltBackend, …)allows in-jail cat, fails outside (HOME secret).seatbelt→machi-sandbox/seatbelt+ optional toolkit; re-exportsSeatbeltBackend/SANDBOX_EXECon macOS.Context
PR #61 landed the port + explicit Shell constructors. This PR is the first real OS backend (not
NoSandbox). Landlock (Linux) remains open.Test plan
cargo clippy --workspace --all-features --all-targets -- -D warningscargo test --workspace --all-featurescargo test -p machi-sandbox --features seatbelt(8 tests incl. live seatbelt)cargo test -p machi-toolkit --features seatbelt(Shell seatbelt e2e)