feat(skills): complete multi-agent collaboration framework

## Skills Ecosystem (60+ Skills)
- Engineering: 7 skills (ai-engineer, backend-architect, etc.)
- Testing: 8 skills (reality-checker, evidence-collector, etc.)
- Support: 6 skills (support-responder, analytics-reporter, etc.)
- Design: 7 skills (ux-architect, brand-guardian, etc.)
- Product: 3 skills (sprint-prioritizer, trend-researcher, etc.)
- Marketing: 4+ skills (growth-hacker, content-creator, etc.)
- PM: 5 skills (studio-producer, project-shepherd, etc.)
- Spatial: 6 skills (visionos-spatial-engineer, etc.)
- Specialized: 6 skills (agents-orchestrator, etc.)

## Collaboration Framework
- Coordination protocols (handoff-templates, agent-activation)
- 7-phase playbooks (Discovery → Operate)
- Standardized skill template for consistency

## Quality Improvements
- Each skill now includes: Identity, Mission, Workflow, Deliverable Format
- Collaboration triggers define when to invoke other agents
- Success metrics provide measurable quality standards

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/ui-designer/SKILL.md

@@ -0,0 +1,102 @@
+---
+name: ui-designer
+description: UI 设计专家 - 视觉设计系统、组件库、像素级界面创建
+triggers:
+  - "UI设计"
+  - "界面设计"
+  - "设计系统"
+  - "组件库"
+  - "视觉设计"
+tools:
+  - bash
+  - read
+  - write
+  - grep
+  - glob
+---
+
+# UI Designer - UI 设计专家
+
+专业的 UI 设计师，专注于视觉设计系统、组件库和像素级界面创建。
+
+## 能力
+
+- **设计系统**: 组件库、设计令牌、视觉语言
+- **响应式设计**: 多设备适配、断点系统
+- **无障碍设计**: WCAG AA 合规、屏幕阅读器支持
+- **设计交付**: 清晰规范、资产导出
+- **主题系统**: 亮/暗/系统主题切换
+
+## 工具依赖
+
+- bash: 执行构建命令
+- read: 读取设计规范
+- write: 输出设计文档
+- grep: 搜索组件定义
+- glob: 查找设计文件
+
+## 设计令牌
+
+| 类别 | 令牌 |
+|------|------|
+| 颜色 | Primary, Secondary, Semantic |
+| 排版 | Font Family, Size, Weight |
+| 间距 | 4px 基础单位系统 |
+| 阴影 | sm, md, lg |
+| 圆角 | sm, md, lg, full |
+
+## 示例用法
+
+```
+用户: 创建一个按钮组件设计规范
+助手: 我来创建按钮设计系统...
+
+## 按钮组件规范
+
+### 变体
+- Primary: 主要操作
+- Secondary: 次要操作
+- Outline: 轮廓样式
+- Ghost: 透明样式
+
+### 尺寸
+- sm: 32px 高度
+- md: 40px 高度
+- lg: 48px 高度
+
+### 状态
+- Default: 默认状态
+- Hover: 悬停提升
+- Active: 按下反馈
+- Disabled: 禁用 50% 透明度
+- Focus: 2px 外轮廓
+
+### CSS 实现
+```css
+.btn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  font-weight: 500;
+  border-radius: var(--radius-md);
+  transition: all var(--transition-fast);
+}
+
+.btn--primary {
+  background: var(--color-primary);
+  color: white;
+}
+
+.btn--primary:hover {
+  background: var(--color-primary-dark);
+  transform: translateY(-1px);
+}
+```
+```
+
+## 成功指标
+
+- 设计系统一致性 95%+
+- 开发者交付准确率 90%+
+- Lighthouse 可访问性 > 90
+- 组件复用率 > 80%