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/state-ground-truth.md

@@ -0,0 +1,80 @@
+---
+title: State Must Represent Ground Truth
+impact: HIGH
+impactDescription: cleaner logic, easier debugging, single source of truth
+tags: state, derived-state, reanimated, hooks
+---
+
+## State Must Represent Ground Truth
+
+State variables—both React `useState` and Reanimated shared values—should
+represent the actual state of something (e.g., `pressed`, `progress`, `isOpen`),
+not derived visual values (e.g., `scale`, `opacity`, `translateY`). Derive
+visual values from state using computation or interpolation.
+
+**Incorrect (storing the visual output):**
+
+```tsx
+const scale = useSharedValue(1)
+
+const tap = Gesture.Tap()
+  .onBegin(() => {
+    scale.set(withTiming(0.95))
+  })
+  .onFinalize(() => {
+    scale.set(withTiming(1))
+  })
+
+const animatedStyle = useAnimatedStyle(() => ({
+  transform: [{ scale: scale.get() }],
+}))
+```
+
+**Correct (storing the state, deriving the visual):**
+
+```tsx
+const pressed = useSharedValue(0) // 0 = not pressed, 1 = pressed
+
+const tap = Gesture.Tap()
+  .onBegin(() => {
+    pressed.set(withTiming(1))
+  })
+  .onFinalize(() => {
+    pressed.set(withTiming(0))
+  })
+
+const animatedStyle = useAnimatedStyle(() => ({
+  transform: [{ scale: interpolate(pressed.get(), [0, 1], [1, 0.95]) }],
+}))
+```
+
+**Why this matters:**
+
+State variables should represent real "state", not necessarily a desired end
+result.
+
+1. **Single source of truth** — The state (`pressed`) describes what's
+   happening; visuals are derived
+2. **Easier to extend** — Adding opacity, rotation, or other effects just
+   requires more interpolations from the same state
+3. **Debugging** — Inspecting `pressed = 1` is clearer than `scale = 0.95`
+4. **Reusable logic** — The same `pressed` value can drive multiple visual
+   properties
+
+**Same principle for React state:**
+
+```tsx
+// Incorrect: storing derived values
+const [isExpanded, setIsExpanded] = useState(false)
+const [height, setHeight] = useState(0)
+
+useEffect(() => {
+  setHeight(isExpanded ? 200 : 0)
+}, [isExpanded])
+
+// Correct: derive from state
+const [isExpanded, setIsExpanded] = useState(false)
+const height = isExpanded ? 200 : 0
+```
+
+State is the minimal truth. Everything else is derived.