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Fixes https://github.com/openai/codex/issues/13638 ## Why VS Code's integrated terminal can run a Linux shell through WSL without exposing `TERM_PROGRAM` to the Linux process, and with crossterm keyboard enhancement flags enabled that environment can turn dead-key composition into malformed key events instead of composed Unicode input. Codex already handles composed Unicode correctly, so the fix is to avoid enabling the terminal mode that breaks this path for the affected terminal combination. ## What Changed - Automatically skip crossterm keyboard enhancement flags when Codex detects WSL plus VS Code, including a Windows-side `TERM_PROGRAM` probe through WSL interop. - Add `CODEX_TUI_DISABLE_KEYBOARD_ENHANCEMENT` so users can force-disable or force-enable the keyboard enhancement policy for diagnosis. ## Verification - Added unit coverage for env parsing, VS Code detection, and the WSL/VS Code auto-disable policy. - `cargo check -p codex-tui` passed. - `./tools/argument-comment-lint/run.py -p codex-tui -- --tests` passed. - `cargo test -p codex-tui` was attempted locally, but the checkout failed during linking before tests executed because V8 symbols from `codex-code-mode` were unresolved for `arm64`.