Gvisor environment - #187
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Mirrors macos-proxy semantics using gVisor (runsc): the same HTTP/HTTPS allowlist proxy fronts outbound traffic, and an OCI bundle generated per invocation restricts filesystem writes to the workspace and a handful of home-directory subpaths, with .clawmini hidden behind a read-only tmpfs.
Runs a fixed suite of six sandbox checks through the named environment's prefix (workspace writable, .clawmini hidden, HTTP_PROXY env, clawmini-lite.js on PATH, non-allowlisted domain blocked, host filesystem escape) and reports PASS/FAIL per check. The suite is the same for every env so the FAILs reveal which aspects each environment actually restricts — e.g. the macos env passes the filesystem checks but fails the network ones, while macos-proxy and gvisor-proxy are designed to pass all six.
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