Add benchmarking-mortgage-underwriting-agents blog post

[mtoles]

• add blog post
• update formatting to support math, tables, and images in blog posts

[github-actions]

⚠️ Notice: Gemfile.lock was modified in this PR.

For our lab website, we keep Gemfile.lock tracked to ensure reproducible CI/CD builds.

Please confirm whether this change is intentional (e.g., adding or updating a Ruby/Jekyll dependency).

If this modification was unintended (often caused by running bundle install locally), please revert the file to match the base branch.

Thanks for helping keep our deployment stable 🙌

[github-actions]

⚠️ This PR modifies structural or configuration files
(e.g., layouts, includes, HTML/CSS, or Gemfile).

These files affect global website behavior.
Please confirm this change is intentional.

If you're only adding/updating content (profile, project, blog, event),
consider limiting modifications to data and content directories.

[github-actions]

⚠️ This PR modifies structural or configuration files
(e.g., layouts, includes, HTML/CSS, or Gemfile).

These files affect global website behavior.
Please confirm this change is intentional.

If you're only adding/updating content (profile, project, blog, event),
consider limiting modifications to data and content directories.

[Alex-XJK]

Looks good. Thanks for your contribution.