Support markdown renderer in feed so mods can output formatted into

Summary

Am building a mod that renders schema db files and also displays table info.

I'd like to have the mod use a ui render that output markdown and the feed rendered it as such.

But any markdown generated is un-formatted:

I'm told that:

⠶ The mod feed surface doesn't support markdown rendering — it's strictly line-based with ANSI escape codes. From the docs: "Rendering is deliberately line-based,
  not component-based." There's no way to render a markdown pipe table in the feed from a mod command. The compact per-column format with colored badges is the
  best that's possible on this surface.

There is a custom renderer so it can output ANSI like:

But markdown could be nice or even larger reddened like Mermaid markdown for graphs and diagrams.

Expected Behavior

Markdown to look render markdown in feed

Actual Behavior

Just raw text

Steps to reproduce the issue

• Build a mod that outputs markdown

Command Code Version

1.5.0

Operating System

macOS

Terminal/IDE

ghostty

Shell

zsh

Additional context

No response

從 feed 介面的基於行的渲染文件開始，並使用會輸出 markdown 的 mod 重現此問題。確定預期支援的 markdown 範圍，以及它應如何與 ANSI 輸出共存；完成的標準是 mod 輸出的 markdown 在 feed 中被渲染，而不是顯示為原始文字。