feat: add CMS Developer agent (WordPress & Drupal)

[itlasso]

Summary

Adds a new CMS Developer agent to the Engineering Division,
specializing in WordPress and Drupal theme and plugin/module development.

Agent Details

• File: engineering/engineering-cms-developer.md
• Emoji: 🧱
• Division: Engineering

Specialties

• WordPress custom theme development (Gutenberg blocks, ACF Pro, CPTs)
• WordPress plugin development (boilerplate, hooks, filters, REST API)
• Drupal custom theme development (Twig, preprocess hooks, libraries)
• Drupal module development (Block plugins, hooks, services, Forms API)
• Content modeling and editorial UX for both platforms
• Accessibility (WCAG 2.1 AA) and Core Web Vitals performance

Deliverables Included

• WordPress custom theme scaffold
• Gutenberg custom block (block.json + render.php)
• ACF Block with render callback
• WordPress plugin boilerplate with PSR-4 autoloading
• Drupal custom module scaffold
• Drupal Twig template with accessible markup
• Drupal preprocess hook with structured data
• Pre-launch checklist
• Success metrics table

Testing

Verified file structure and formatting matches existing agents in the Engineering Division.