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## Why `codex sandbox` previously required an OS subcommand like `linux`, `macos`, or `windows`, even though the command can only run the sandbox backend available on the current host. That made the CLI imply a cross-OS choice that does not exist. ## What changed - Collapse `codex sandbox <os>` into `codex sandbox [COMMAND]...` by wiring the `sandbox` parser directly to the host-specific backend args with `cfg`. - Keep the existing backend runners for Seatbelt, Linux sandbox, and Windows restricted token. - Rename the public Windows debug sandbox runner to `run_command_under_windows_sandbox` for clarity. - Update the Rust sandbox docs and related README references to describe host OS selection and avoid pointing readers at legacy `sandbox_mode` config. ## Arg0 compatibility The `codex-linux-sandbox` helper path is still handled before normal CLI parsing. `arg0_dispatch()` checks whether the executable basename is `codex-linux-sandbox` and directly calls `codex_linux_sandbox::run_main()`, so removing the `sandbox linux` parser branch does not affect the arg0 helper flow. ## Verification - `cargo test -p codex-cli` - `cargo test -p codex-arg0` - `just fix -p codex-cli`