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## Why `spawn_command_under_seatbelt()` in `codex-rs/core/src/seatbelt.rs` had fallen out of production use and was only referenced by test-only wrappers. That left us with sandbox tests that could stay green even if the actual seatbelt exec path regressed, because production shell execution now flows through `SandboxManager::transform()` and `ExecRequest::from_sandbox_exec_request()` instead of that helper. Removing the dead helper also exposed one downstream `codex-exec` integration test that still imported it, which broke `just clippy`. ## What Changed - Removed `codex-rs/core/src/seatbelt.rs` and stopped exporting `codex_core::seatbelt`. - Removed the redundant `codex-rs/core/tests/suite/seatbelt.rs` coverage that only exercised the dead helper. - Kept the `openpty` regression check, but moved it into `codex-rs/core/tests/suite/exec.rs` so it now runs through `process_exec_tool_call()`. - Fixed the seatbelt denial test in `codex-rs/core/tests/suite/exec.rs` to use `/usr/bin/touch`, so it actually exercises the sandbox instead of a nonexistent path. - Updated `codex-rs/exec/tests/suite/sandbox.rs` on macOS to build the sandboxed command through `build_exec_request()` and spawn the transformed command, instead of importing the removed helper. - Left the lower-level seatbelt policy coverage in `codex-rs/sandboxing/src/seatbelt_tests.rs`, where the policy generator is still covered directly. ## Verification - `cargo test -p codex-core suite::exec::` - `cargo test -p codex-exec` - `cargo clippy -p codex-exec --tests -- -D warnings`