Release v4.6.0: SPDD & Radix UI Design System

Agent workflow docs (SPDD) and Radix UI design system skill.

This release introduces the SPDD (Specs-Plan-Design-Develop) documentation workflow and a comprehensive new skill for the Radix UI design system.

New Skills (1)

• radix-ui-design-system – Build accessible design systems with Radix UI primitives (headless, theming, WCAG, examples).

Documentation Improvements

• SPDD Workflow – Added skills/SPDD/ documentation covering Research, Specification, and Implementation phases (1-research.md, 2-spec.md, 3-implementation.md).

Registry Update

• Total Skills: 626 (from 625)
• New Skills Added: 1
• Catalog: Regenerated

Credits

• @devchangjun for Radix UI skill (PR #48)
• @c1c3ru for Agent Skills (PR #47)