Codex app

# Codex app ### New features - You can now fork a conversation from an earlier message, not just the latest turn. - Added slash commands for switching models and reasoning levels, and made slash commands work in the middle of a draft prompt. - Added notifications for plan mode questions so it's easier to notice when Codex needs input. ### Performance improvements and bug fixes - Fixed thread handoff and subagent navigation issues across worktrees and the VS Code extension. - Additional performance improvements and bug fixes.