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/README.md

@@ -0,0 +1,60 @@
+# React Composition Patterns
+
+A structured repository for React composition patterns that scale. These
+patterns help avoid boolean prop proliferation by using compound components,
+lifting state, and composing internals.
+
+## Structure
+
+- `rules/` - Individual rule files (one per rule)
+  - `_sections.md` - Section metadata (titles, impacts, descriptions)
+  - `_template.md` - Template for creating new rules
+  - `area-description.md` - Individual rule files
+- `metadata.json` - Document metadata (version, organization, abstract)
+- **`AGENTS.md`** - Compiled output (generated)
+
+## Rules
+
+### Component Architecture (CRITICAL)
+
+- `architecture-avoid-boolean-props.md` - Don't add boolean props to customize
+  behavior
+- `architecture-compound-components.md` - Structure as compound components with
+  shared context
+
+### State Management (HIGH)
+
+- `state-lift-state.md` - Lift state into provider components
+- `state-context-interface.md` - Define clear context interfaces
+  (state/actions/meta)
+- `state-decouple-implementation.md` - Decouple state management from UI
+
+### Implementation Patterns (MEDIUM)
+
+- `patterns-children-over-render-props.md` - Prefer children over renderX props
+- `patterns-explicit-variants.md` - Create explicit component variants
+
+## Core Principles
+
+1. **Composition over configuration** — Instead of adding props, let consumers
+   compose
+2. **Lift your state** — State in providers, not trapped in components
+3. **Compose your internals** — Subcomponents access context, not props
+4. **Explicit variants** — Create ThreadComposer, EditComposer, not Composer
+   with isThread
+
+## Creating a New Rule
+
+1. Copy `rules/_template.md` to `rules/area-description.md`
+2. Choose the appropriate area prefix:
+   - `architecture-` for Component Architecture
+   - `state-` for State Management
+   - `patterns-` for Implementation Patterns
+3. Fill in the frontmatter and content
+4. Ensure you have clear examples with explanations
+
+## Impact Levels
+
+- `CRITICAL` - Foundational patterns, prevents unmaintainable code
+- `HIGH` - Significant maintainability improvements
+- `MEDIUM` - Good practices for cleaner code