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-react-native-skills/rules/animation-derived-value.md

@@ -0,0 +1,53 @@
+---
+title: Prefer useDerivedValue Over useAnimatedReaction
+impact: MEDIUM
+impactDescription: cleaner code, automatic dependency tracking
+tags: animation, reanimated, derived-value
+---
+
+## Prefer useDerivedValue Over useAnimatedReaction
+
+When deriving a shared value from another, use `useDerivedValue` instead of
+`useAnimatedReaction`. Derived values are declarative, automatically track
+dependencies, and return a value you can use directly. Animated reactions are
+for side effects, not derivations.
+
+**Incorrect (useAnimatedReaction for derivation):**
+
+```tsx
+import { useSharedValue, useAnimatedReaction } from 'react-native-reanimated'
+
+function MyComponent() {
+  const progress = useSharedValue(0)
+  const opacity = useSharedValue(1)
+
+  useAnimatedReaction(
+    () => progress.value,
+    (current) => {
+      opacity.value = 1 - current
+    }
+  )
+
+  // ...
+}
+```
+
+**Correct (useDerivedValue):**
+
+```tsx
+import { useSharedValue, useDerivedValue } from 'react-native-reanimated'
+
+function MyComponent() {
+  const progress = useSharedValue(0)
+
+  const opacity = useDerivedValue(() => 1 - progress.get())
+
+  // ...
+}
+```
+
+Use `useAnimatedReaction` only for side effects that don't produce a value
+(e.g., triggering haptics, logging, calling `runOnJS`).
+
+Reference:
+[Reanimated useDerivedValue](https://docs.swmansion.com/react-native-reanimated/docs/core/useDerivedValue)