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## Why Fixes #17139. On macOS, runtime diagnostics such as `MallocStackLogging` messages can be written directly to process stderr while the inline TUI owns the terminal. Those bytes paint into the same viewport as the composer without passing through the renderer or composer state, making diagnostic output appear to leak into the input area. ## What Changed - Add a macOS terminal stderr guard while the inline TUI owns the viewport. - Restore stderr when Codex returns terminal ownership for external interactive programs, suspend/resume, panic handling, and normal shutdown. - Add an fd-level regression test that verifies output is suppressed only while terminal ownership is held and restored at each handoff boundary. ## How to Test 1. On macOS, launch the interactive TUI and leave the composer visible. 2. Exercise the workflow that triggers an allocator/runtime stderr diagnostic during an active session, as reported in #17139. 3. Confirm the diagnostic no longer overwrites the active composer region. 4. Suspend or exit the TUI and confirm subsequent terminal stderr output remains visible. The platform diagnostic is environment-dependent, so the deterministic regression check is the new fd-lifecycle test in `tui::terminal_stderr::tests::suppresses_stderr_only_while_terminal_is_owned`. Targeted validation: - `just argument-comment-lint-from-source -p codex-tui` passed. - `just test -p codex-tui` exercised and passed the new stderr-guard regression test. The full invocation currently fails in two unrelated guardian-policy tests, `update_feature_flags_disabling_guardian_clears_review_policy_and_restores_default` and `update_feature_flags_disabling_guardian_clears_manual_review_policy_without_history`, which reproduce when rerun in isolation.