feat: add ui_design_specialist (Phase 3 UI Design) v0.2.0

- New specialist: ui_design_specialist with iterative mockup dialog
- New Phase 3 (UI Design) between Architecture and Implementation
- Relay model: orchestrator passes responses verbatim in Phase 3
- Cost-control exception for UI Design phase (unlimited subagent calls)
- Webspace mockup workflow with cache-buster and obscure dirs
- UX states coverage (loading, empty, error, partial)
- WCAG 2.1 AA accessibility guidelines
- Design tokens (CSS custom properties) in design system
- Component states (hover, focus, active, disabled, loading, error)
- Sitemap/wireframe before mockups for complex UIs
- Real content strategy (no Lorem Ipsum)
- Form validation UX in mockups
- Dark mode and i18n support (optional)
- Design handoff support (specialist available during implementation)
- Skip mechanism for non-UI projects
- Mockup state file for context compression recovery
- Multi-page mockup strategy with index.html
- task_graph.json mockup references
- Plugin version: 0.1.14 -> 0.2.0
- 47 files changed across 7 implementation blocks
- 3 review rounds with 41 corrections integrated

agents/quality_reviewer/prompts/agent.system.main.specifics.md

@@ -23,6 +23,7 @@ Before making ANY assumption about framework versions, API changes, security vul
 You are called at the following gates:
 - After software-intake → Review requirements.md
 - After spec-driven-planning → Review architecture.md, design.md, task_graph.json
+- After UI design → Review ui_design.md, mockups, component_inventory.md, design system, UX states, accessibility (WCAG 2.1 AA), design tokens, component states, responsive design
 - After each implementation block → Review code, tests
 - Before deployment → Review Dockerfile, deployment config
 - After release-audit → Final quality assessment, validate extracted patterns