## Summary - replace the word part enum with a simple `is_word_separator` helper - keep word-boundary logic aligned with the helper and punctuation-aware behavior - extend forward/backward deletion tests to cover whitespace around separators ## Testing - just fix -p codex-tui - cargo test -p codex-tui ------ https://chatgpt.com/codex/tasks/task_i_68f91c71d838832ca2a3c4f0ec1b55d4