Codex App: expose reasoning summaries or progress traces when configured

What problem are you trying to solve?

In Codex App, turns currently only show a brief blinking Thinking state and then the final answer. Even with reasoning-related config enabled, I do not see an expandable reasoning summary, progress trace, or Thought-style section while the turn is running or after it completes.

This makes it harder to understand what the agent is doing on longer tasks, compare behavior with other agent UIs, or debug cases where the answer is surprising.

Current behavior

• I submit a prompt in Codex App.
• The UI shows a blinking Thinking label.
• The final response appears.
• No visible reasoning summary / progress trace is shown.

Expected behavior

It would be helpful if Codex App exposed an optional, expandable reasoning-summary/progress panel when configured, similar in spirit to the way some agent UIs show a Thought: or trace section. This does not need to expose private chain-of-thought verbatim; a surfaced reasoning summary or structured progress trace would be enough.

Ideally this would work consistently with the existing config knobs:

model_reasoning_summary = "detailed"
hide_agent_reasoning = false
show_raw_agent_reasoning = true

If Codex App intentionally does not support showing these events, it would also be helpful for the UI or docs to make that clear.

Environment

• Codex App: 26.602.71036 (bundle version 3685)
• Codex CLI: 0.137.0
• macOS: 13.3 (22E252)
• Model: gpt-5.5
• Reasoning effort: high
• Service tier: fast

Related context

I found a few possibly related issues where reasoning summaries / progress traces appear to be present in some layer but are not reliably visible in a client UI:

• #24287
• #16801
• #9470

This request is specifically for Codex App / desktop UI behavior.