Add lightweight publications CMS with rapid AI briefing feed

[Gabriel-Dalton]

Motivation

• Provide a simple, CMS-like workflow so teams can publish fast desk briefings or full publications without editing HTML every time.
• Surface a professional-looking, institutionally styled “AI news and policy updates” feed for timely items while preserving the existing pillar-based publications layout.

Description

• Add a renderer js/publications-cms.js that populates pillar sections and a new news feed from a shared data file.
• Extend js/publications-data.js to support type: 'publication' | 'news', add two example news records, implement getNewsBriefings(), and keep getPublications() filtered to non-news entries.
• Convert publications.html to load the new scripts, add an editorial note block, a #newsFeed area for briefings, and dynamic containers for each pillar (#safetyPublications, #sustainabilityPublications, #ethicsPublications).
• Add styling in css/styles.css for the editorial note and news-feed cards and document the two publishing modes in content/publications/README.md and README.md.

Testing

• Ran node --check js/publications-data.js which reported no syntax errors.
• Ran node --check js/publications-cms.js which reported no syntax errors.
• Verified that the modified publications.html loads the new scripts and that the site structure is present according to the renderer's expected DOM IDs.

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Codex Task