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Fixes #2558 Codex uses alternate screen mode (CSI 1049) which, per xterm spec, doesn't support scrollback. Zellij follows this strictly, so users can't scroll back through output. **Changes:** - Add `tui.alternate_screen` config: `auto` (default), `always`, `never` - Add `--no-alt-screen` CLI flag - Auto-detect Zellij and skip alt screen (uses existing `ZELLIJ` env var detection) **Usage:** ```bash # CLI flag codex --no-alt-screen # Or in config.toml [tui] alternate_screen = "never" ``` With default `auto` mode, Zellij users get working scrollback without any config changes. --------- Co-authored-by: Josh McKinney <joshka@openai.com>