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## Why Codex now has configurable TUI keymaps, but the composer still behaves like a plain text field. Users who prefer modal editing need a way to keep Vim muscle memory while drafting prompts, and the keymap picker needs to expose Vim-specific actions if those bindings are configurable instead of hardcoded. ## What Changed - Adds composer Vim mode with insert/normal state, common normal-mode movement and editing commands, `d`/`y` operator-pending flows, and mode-aware footer and cursor indicators. - Adds `/vim`, an optional global `toggle_vim_mode` binding, and `tui.vim_mode_default` so Vim mode can be toggled per session or enabled as the default composer state. - Extends runtime and config keymaps with `vim_normal` and `vim_operator` contexts, exposes those contexts in `/keymap`, refreshes the config schema, and validates Vim bindings separately. - Integrates Vim normal mode with existing composer behavior: `/` opens slash command entry, `!` enters shell mode, `j`/`k` navigate history at history boundaries, successful submissions reset back to normal mode, and paste burst handling remains insert-mode only. - Teaches the TUI render path to apply and restore cursor style so Vim insert mode can use a bar cursor without leaving the terminal in that state after exit. ## Validation - `cargo test -p codex-tui keymap -- --nocapture` on the keymap/Vim coverage - `cargo insta pending-snapshots` ## Docs This introduces user-facing `/vim`, `tui.vim_mode_default`, and Vim keymap contexts under `tui.keymap`, so the public CLI configuration and slash-command docs should be updated before the feature ships.