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/scroll-position-no-state.md

@@ -0,0 +1,82 @@
+---
+title: Never Track Scroll Position in useState
+impact: HIGH
+impactDescription: prevents render thrashing during scroll
+tags: scroll, performance, reanimated, useRef
+---
+
+## Never Track Scroll Position in useState
+
+Never store scroll position in `useState`. Scroll events fire rapidly—state
+updates cause render thrashing and dropped frames. Use a Reanimated shared value
+for animations or a ref for non-reactive tracking.
+
+**Incorrect (useState causes jank):**
+
+```tsx
+import { useState } from 'react'
+import {
+  ScrollView,
+  NativeSyntheticEvent,
+  NativeScrollEvent,
+} from 'react-native'
+
+function Feed() {
+  const [scrollY, setScrollY] = useState(0)
+
+  const onScroll = (e: NativeSyntheticEvent<NativeScrollEvent>) => {
+    setScrollY(e.nativeEvent.contentOffset.y) // re-renders on every frame
+  }
+
+  return <ScrollView onScroll={onScroll} scrollEventThrottle={16} />
+}
+```
+
+**Correct (Reanimated for animations):**
+
+```tsx
+import Animated, {
+  useSharedValue,
+  useAnimatedScrollHandler,
+} from 'react-native-reanimated'
+
+function Feed() {
+  const scrollY = useSharedValue(0)
+
+  const onScroll = useAnimatedScrollHandler({
+    onScroll: (e) => {
+      scrollY.value = e.contentOffset.y // runs on UI thread, no re-render
+    },
+  })
+
+  return (
+    <Animated.ScrollView
+      onScroll={onScroll}
+      // higher number has better performance, but it fires less often.
+      // unset this if you need higher precision over performance.
+      scrollEventThrottle={16}
+    />
+  )
+}
+```
+
+**Correct (ref for non-reactive tracking):**
+
+```tsx
+import { useRef } from 'react'
+import {
+  ScrollView,
+  NativeSyntheticEvent,
+  NativeScrollEvent,
+} from 'react-native'
+
+function Feed() {
+  const scrollY = useRef(0)
+
+  const onScroll = (e: NativeSyntheticEvent<NativeScrollEvent>) => {
+    scrollY.current = e.nativeEvent.contentOffset.y // no re-render
+  }
+
+  return <ScrollView onScroll={onScroll} scrollEventThrottle={16} />
+}
+```