Release the accessible button component

[JaydenYoonZK]

Summary

• rebuild the modern component with a moving cap and fixed edge and ground shadow
• preserve the original .JayBrown class for existing markup
• add JaydenART green and brown variants with documented CSS custom properties
• replace the old demo with secure, semantic, responsive HTML and local styles
• add keyboard, disabled, reduced-motion, forced-colors, and touch states
• add tests, CI, security guidance, contributing documentation, and a changelog

Why

The original demo used invalid nested controls, removed keyboard outlines, shifted layout on press, loaded an external background image, and had no automated checks. Version 2.0 turns the idea into a small component other developers can safely reuse.

Validation

• six deterministic tests pass
• CI covers Node.js 20, 22, and 24
• desktop and 390 pixel mobile browser checks have zero overflow
• keyboard activation exposes a visible 3 pixel focus ring
• WCAG contrast checks pass for every measured text pair
• CSP blocks all unneeded resource types and the page contains no scripts
• public trace, dash, and external CSS dependency scans are clean