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Delegate sandbox process cgroups at startup - #612
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SandboxIO starts without writable cgroup delegation, preventing it from containing descendants that create new POSIX sessions. Prepare a dedicated cgroup beneath the existing guest resource hierarchy in the E2B and microsandbox startup adapters, then start the service as UID/GID 1000 within it. Unavailable delegation or an existing group fails startup; checkpoint restore keeps its existing VM state.
Validation: both real bootstrap paths exercised against nested Linux cgroups in disposable containers, including unprivileged child creation/migration, detached-descendant kill and empty-group cleanup; E2B startup failure regressions, both micro modules, build/vet and documentation checks pass. Actual micro guest prerequisites were probed separately. Final native qualification with the new ProcessService remains part of the integrated cancellation work; this change supplies provisioning only.
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