Improve PDF accessibility with PDF/UA-2 compliance and metadata

[Copilot]

Improves accessibility of the PDF rendered from LaTeX files by implementing PDF/UA-2 standard compliance and adding comprehensive metadata.

Changes

• DocumentMetadata: Upgraded to PDF/UA-2 standard with PDF 2.0, added firstaid option, set lang=en-US
• PDF Metadata: Added title, authors, subject, keywords, and contact information (address, email, URL) to \hypersetup
• Alt Text: Added descriptive alt text to Protection Level figure in 7forecast.tex
• Accessibility Statement: Added contact section after title page with email, GitHub, and website links

\DocumentMetadata{
  testphase={phase-III,math,firstaid},
  pdfversion=2.0,
  pdfstandard=ua-2,
  lang=en-US
}

The PDF/UA-2 standard ensures compatibility with screen readers and assistive technologies. Contact metadata makes it easy to report accessibility issues.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>improve accessibility of the ss user manual pdf</issue_title>
<issue_description>Improve accessibility of the pdf file rendered from all of the .tex files in the main folder. These are rendered using lualatex. Continued from #20.</issue_description>

<agent_instructions>Please try to improve the accessibility of the pdf rendered from the latex files (the .tex files in the main folder).</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@k-doering-NOAA @kellijohnson-NOAA suggested looking at the .json file generated as an intermediate to creating a pdf. This should provide some insight into which elements are not being tagged correctly

Another suggestion is to add contact info so it easy to know who to contact if something isn't accessible.</comment_new>

• Fixes improve accessibility of the ss user manual pdf #46

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