[bug] `!<cmd>` output invisible to Codex (defeats the entire Product UX purpose of the feature)

What version of Codex is running?

codex-cli 0.52.0

What subscription do you have?

API Key

Which model were you using?

gpt-5-codex high

What platform is your computer?

Darwin 25.0.0 arm64 arm

What issue are you seeing?

Current behavior:

Running !ls or !tree in Codex terminal executes, but Codex sees nothing.

Why this breaks the UX:

If I just wanted to run commands, I'd use a separate terminal. The entire product purpose of !cmd is collaborative execution: showing the agent both inputs + outputs (e.g., exploring a codebase together).

Impact:

Can't collaborate with Codex without copy-pasting everything manually.

What steps can reproduce the bug?

<img width="523" height="200" alt="Image" src="https://github.com/user-attachments/assets/0e0c066d-26ae-49a9-a344-7637e7b28e6a" />

What is the expected behavior?

<img width="746" height="162" alt="Image" src="https://github.com/user-attachments/assets/efea1ba3-30ca-4aff-90ff-06cd8702b0b2" />

Additional information

Labeling this as a design-level bug. While the “bug” label is usually used for implementation issues, the current behavior represents a break in the product’s intended UX design.