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Implement /btw as an ephemeral forked side-thread flow in the TUI and the mirrored tui_app_server frontend. The branch adds BTW thread lifecycle and navigation handling, uses interrupted-snapshot forks when needed, keeps BTW threads hidden from normal agent navigation, routes BTW prompts to the model, and mirrors the footer/fork-banner UI plus replay-only fallback behavior in the app-server variant. Co-authored-by: Codex <noreply@openai.com>