CLI markdown tables are not rendered as readable aligned tables in TUI output

What version of Codex CLI is running?

codex-cli 0.115.0

What subscription do you have?

ChatGPT Plus / API-backed local usage

Which model were you using?

Model-independent; reproduced with markdown output from Codex CLI regardless of model

What platform is your computer?

Linux 6.8.0-1047-oracle aarch64 aarch64

What terminal emulator and version are you using (if applicable)?

tmux on Linux terminal environment (TERM=dumb in the current session)

What issue are you seeing?

Markdown tables in Codex CLI/TUI output are not rendered as readable terminal tables. They are effectively treated as plain markdown text, so column structure is lost and table-heavy responses are difficult to scan.

I investigated this in the renderer and confirmed the issue is in the CLI source, not something that can be fixed with a plugin or skill.

What steps can reproduce the bug?

1. Run Codex CLI in the terminal.
2. Ask for output that includes a markdown table, for example a small comparison table.
3. Observe the rendered output in the TUI.

Minimal markdown sample:

| Left | Center | Right |
|:-----|:------:|------:|
| a    | b      | c     |

Current behavior is that this does not render as a proper aligned terminal table.

What is the expected behavior?

The CLI should parse markdown tables and render them as readable aligned plain-text terminal tables, including:

• header separator rendering
• column alignment
• cell wrapping within available width
• sensible handling of links inside table cells
• consistent behavior in both codex-rs/tui and codex-rs/tui_app_server

Additional information

I already have a tested patch ready locally.

Implementation summary:

• enable pulldown-cmark table parsing
• render tables as aligned plain-text terminal tables
• preserve indentation/prefix behavior around tables
• keep codex-rs/tui and codex-rs/tui_app_server in sync
• add focused tests and snapshot updates

Validation completed locally:

• cargo test -p codex-tui --lib table_
• cargo test -p codex-tui-app-server --lib table_
• cargo test -p codex-tui --lib markdown_render_complex_snapshot
• cargo test -p codex-tui-app-server --lib markdown_render_complex_snapshot
• just fmt
• just fix -p codex-tui
• just fix -p codex-tui-app-server
• ./tools/argument-comment-lint/run.sh

If this approach matches maintainers' intended direction, I can open the PR immediately.