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## Summary - Treat PowerShell stop-parsing token forms as unsupported in the AST-backed command flattener. - Add focused regressions at the parser layer and Windows command-safety layer. ## Why The command-safety parser lowers PowerShell AST elements into argv-like words. Stop-parsing syntax preserves a native-command argument shape that this lowering does not model, so these forms should stay on the conservative unsupported path. ## Validation - `cargo fmt --manifest-path codex-rs/Cargo.toml --all --check` - `cargo test --manifest-path codex-rs/Cargo.toml -p codex-shell-command`