- Added composer.json with dependencies and autoload configuration.
- Created the Codex core utility class with various factory methods for
  generating UI components using the Codex design system.
- Implemented methods for HTML element generation, including element(),
  rawElement(), openElement(), and closeElement().
- Ensured base class inclusion via the ensureBaseClass() method.
- Added factory methods for creating instances of Accordion, Button,
  Card, Checkbox, Field, InfoChip, Label, Message, ProgressBar, Radio,
  Select, Tabs, TextArea, TextInput, and Thumbnail components.
- Configured testing and code quality tools in composer.json.