feat: Complete fleet — 94 skills across 10+ domains

Pulled ALL skills from 15 source repositories:
- anthropics/skills: 16 (docs, design, MCP, testing)
- obra/superpowers: 14 (TDD, debugging, agents, planning)
- coreyhaines31/marketingskills: 25 (marketing, CRO, SEO, growth)
- better-auth/skills: 5 (auth patterns)
- vercel-labs/agent-skills: 5 (React, design, Vercel)
- antfu/skills: 16 (Vue, Vite, Vitest, pnpm, Turborepo)
- Plus 13 individual skills from various repos

Mosaic Stack is not limited to coding — the Orchestrator and
subagents serve coding, business, design, marketing, writing,
logistics, analysis, and more.

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

skills/vercel-composition-patterns/SKILL.md

@@ -0,0 +1,89 @@
+---
+name: vercel-composition-patterns
+description:
+  React composition patterns that scale. Use when refactoring components with
+  boolean prop proliferation, building flexible component libraries, or
+  designing reusable APIs. Triggers on tasks involving compound components,
+  render props, context providers, or component architecture. Includes React 19
+  API changes.
+license: MIT
+metadata:
+  author: vercel
+  version: '1.0.0'
+---
+
+# React Composition Patterns
+
+Composition patterns for building flexible, maintainable React components. Avoid
+boolean prop proliferation by using compound components, lifting state, and
+composing internals. These patterns make codebases easier for both humans and AI
+agents to work with as they scale.
+
+## When to Apply
+
+Reference these guidelines when:
+
+- Refactoring components with many boolean props
+- Building reusable component libraries
+- Designing flexible component APIs
+- Reviewing component architecture
+- Working with compound components or context providers
+
+## Rule Categories by Priority
+
+| Priority | Category                | Impact | Prefix          |
+| -------- | ----------------------- | ------ | --------------- |
+| 1        | Component Architecture  | HIGH   | `architecture-` |
+| 2        | State Management        | MEDIUM | `state-`        |
+| 3        | Implementation Patterns | MEDIUM | `patterns-`     |
+| 4        | React 19 APIs           | MEDIUM | `react19-`      |
+
+## Quick Reference
+
+### 1. Component Architecture (HIGH)
+
+- `architecture-avoid-boolean-props` - Don't add boolean props to customize
+  behavior; use composition
+- `architecture-compound-components` - Structure complex components with shared
+  context
+
+### 2. State Management (MEDIUM)
+
+- `state-decouple-implementation` - Provider is the only place that knows how
+  state is managed
+- `state-context-interface` - Define generic interface with state, actions, meta
+  for dependency injection
+- `state-lift-state` - Move state into provider components for sibling access
+
+### 3. Implementation Patterns (MEDIUM)
+
+- `patterns-explicit-variants` - Create explicit variant components instead of
+  boolean modes
+- `patterns-children-over-render-props` - Use children for composition instead
+  of renderX props
+
+### 4. React 19 APIs (MEDIUM)
+
+> **⚠️ React 19+ only.** Skip this section if using React 18 or earlier.
+
+- `react19-no-forwardref` - Don't use `forwardRef`; use `use()` instead of `useContext()`
+
+## How to Use
+
+Read individual rule files for detailed explanations and code examples:
+
+```
+rules/architecture-avoid-boolean-props.md
+rules/state-context-interface.md
+```
+
+Each rule file contains:
+
+- Brief explanation of why it matters
+- Incorrect code example with explanation
+- Correct code example with explanation
+- Additional context and references
+
+## Full Compiled Document
+
+For the complete guide with all rules expanded: `AGENTS.md`