Open Codex 0.133.0

Open Codex 0.133.0

• Merge upstream openai/codex through rust-v0.133.0 (59 upstream commits, 361 files, +18.2k / -2.3k) on top of the 0.131.6 fork base. Backup tag backup/before-merge-0.133.0-20260524 preserves the pre-merge state.
• Preserve every fork-specific feature across the merge: agent-view session browser (Left-arrow overlay + codex agents subcommand), contract-first subagent spawn guidance with CollabAgentState receipt fields surfaced into the background-task panel, Zellij-aware insert_history and alt-screen handling, background subagent/terminal status-line refresh, /effort / /export / /rename / /btw / /collab / /memory / /memory-overlay, per-turn xhigh / ulw / ultra reasoning markers reflected live in the status line, active-staging memory overlay, and the @leonw24/open-codex npm package identity.
• Take upstream's new vendor layout in codex-cli/bin/codex.js and scripts/build_npm_package.py while keeping fork update commands (npm install -g @leonw24/open-codex@latest).
• Merge core::state::session::SessionState to use upstream's plural pending_session_start_sources: VecDeque<...> while keeping fork memory_overlay + last_injected_memory_overlay_revision.
• Chain upstream sync_active_thread_reasoning_setting(app_server, effort) and fork sync_active_thread_model_settings_to_cached_session() so /effort changes propagate both to the app-server and to the locally cached session.
• Preserve fork Shift+Tab reasoning speed toggle and fast_default_opt_out tracking while adding upstream refresh_effective_service_tier and the new active_permission_profile slot in override_turn_context.
• Preserve fork /btw (StartBtw lightweight inline thread) dispatch ahead of upstream's combined Side | Btw empty-side-conversation handler.
• Fix three Fast-mode tests by enabling Feature::FastMode and using ServiceTier::Fast.request_value() after upstream gated effective_service_tier behind that feature; two further Fast tests stay #[ignore] pending a fork policy decision on /fast off override shape and queued-turn tier inheritance.