Open Codex 0.131.6

Open Codex 0.131.6

• Add the first beta version of agent-view: codex agents can inspect saved sessions offline, and the TUI session browser can open from the composer with Left arrow.
• Render the agent-view session browser as a full-screen overlay with grouped session rows, peek preview, delete confirmation, resume, and start-new-session flows.
• Mark agent-view as beta in this release: the core browsing/resume workflow is available, but UI polish and interaction details may still change.
• Fix the 0.131 merge regression where standalone xhigh, ultra, or ulw markers no longer submit the current query with xhigh reasoning.
• Show the per-turn xhigh override in model-with-reasoning status-line output while that foreground turn is pending or running, without mutating persistent session defaults.
• Keep per-turn effort override state across thread switch capture/restore.
• Fix background task status-line drift so /ps and the footer agree when background terminals or subagents start, finish, or are cleared.
• Preserve Zellij pane scroll behavior by rendering TUI inline under Zellij instead of trapping pane scroll in the alt screen.
• Tighten subagent spawning guidance around contract-first delegation and quota-aware cleanup.