Codex 0.157.0 makes fullscreen transcripts the default and starts a background server automatically for interactive sessions

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openai/codex rust-v0.157.0 (2026-09-25) turns on fullscreen transcripts by default, adds Shift-click selection extension and auto-starts a background server for eligible interactive sessions, with recovery choices when server settings conflict. An 'f' shortcut forks a conversation that is open in another app, and /import now works in remote and background-server sessions. Under the hood, #47094 restricts Unix local MCP servers to stdio descriptors and #47132 lets callers supply their own MITM CAs to the network proxy, which matters for corporate TLS-inspecting networks.