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/pinia/references/best-practices-testing.md

@@ -0,0 +1,212 @@
+---
+name: testing
+description: Unit testing stores and components with @pinia/testing
+---
+
+# Testing Stores
+
+## Unit Testing Stores
+
+Create a fresh pinia instance for each test:
+
+```ts
+import { setActivePinia, createPinia } from 'pinia'
+import { useCounterStore } from '../src/stores/counter'
+
+describe('Counter Store', () => {
+  beforeEach(() => {
+    setActivePinia(createPinia())
+  })
+
+  it('increments', () => {
+    const counter = useCounterStore()
+    expect(counter.n).toBe(0)
+    counter.increment()
+    expect(counter.n).toBe(1)
+  })
+})
+```
+
+### With Plugins
+
+```ts
+import { setActivePinia, createPinia } from 'pinia'
+import { createApp } from 'vue'
+import { somePlugin } from '../src/stores/plugin'
+
+const app = createApp({})
+
+beforeEach(() => {
+  const pinia = createPinia().use(somePlugin)
+  app.use(pinia)
+  setActivePinia(pinia)
+})
+```
+
+## Testing Components
+
+Install `@pinia/testing`:
+
+```bash
+npm i -D @pinia/testing
+```
+
+Use `createTestingPinia()`:
+
+```ts
+import { mount } from '@vue/test-utils'
+import { createTestingPinia } from '@pinia/testing'
+import { useSomeStore } from '@/stores/myStore'
+
+const wrapper = mount(Counter, {
+  global: {
+    plugins: [createTestingPinia()],
+  },
+})
+
+const store = useSomeStore()
+
+// Manipulate state directly
+store.name = 'new name'
+store.$patch({ name: 'new name' })
+
+// Actions are stubbed by default
+store.someAction()
+expect(store.someAction).toHaveBeenCalledTimes(1)
+```
+
+## Initial State
+
+Set initial state for tests:
+
+```ts
+const wrapper = mount(Counter, {
+  global: {
+    plugins: [
+      createTestingPinia({
+        initialState: {
+          counter: { n: 20 }, // Store name → initial state
+        },
+      }),
+    ],
+  },
+})
+```
+
+## Action Stubbing
+
+### Execute Real Actions
+
+```ts
+createTestingPinia({ stubActions: false })
+```
+
+### Selective Stubbing
+
+```ts
+// Only stub specific actions
+createTestingPinia({
+  stubActions: ['increment', 'reset'],
+})
+
+// Or use a function
+createTestingPinia({
+  stubActions: (actionName, store) => {
+    if (actionName.startsWith('set')) return true
+    return false
+  },
+})
+```
+
+### Mock Action Return Values
+
+```ts
+import type { Mock } from 'vitest'
+
+// After getting store
+store.someAction.mockResolvedValue('mocked value')
+```
+
+## Mocking Getters
+
+Getters are writable in tests:
+
+```ts
+const pinia = createTestingPinia()
+const counter = useCounterStore(pinia)
+
+counter.double = 3 // Override computed value
+
+// Reset to default behavior
+counter.double = undefined
+counter.double // Now computed normally
+```
+
+## Custom Spy Function
+
+If not using Jest/Vitest with globals:
+
+```ts
+import { vi } from 'vitest'
+
+createTestingPinia({
+  createSpy: vi.fn,
+})
+```
+
+With Sinon:
+
+```ts
+import sinon from 'sinon'
+
+createTestingPinia({
+  createSpy: sinon.spy,
+})
+```
+
+## Pinia Plugins in Tests
+
+Pass plugins to `createTestingPinia()`:
+
+```ts
+import { somePlugin } from '../src/stores/plugin'
+
+createTestingPinia({
+  stubActions: false,
+  plugins: [somePlugin],
+})
+```
+
+**Don't use** `testingPinia.use(MyPlugin)` - pass plugins in options.
+
+## Type-Safe Mocked Store
+
+```ts
+import type { Mock } from 'vitest'
+import type { Store, StoreDefinition } from 'pinia'
+
+function mockedStore<TStoreDef extends () => unknown>(
+  useStore: TStoreDef
+): TStoreDef extends StoreDefinition<infer Id, infer State, infer Getters, infer Actions>
+  ? Store<Id, State, Record<string, never>, {
+      [K in keyof Actions]: Actions[K] extends (...args: any[]) => any
+        ? Mock<Actions[K]>
+        : Actions[K]
+    }>
+  : ReturnType<TStoreDef> {
+  return useStore() as any
+}
+
+// Usage
+const store = mockedStore(useSomeStore)
+store.someAction.mockResolvedValue('value') // Typed!
+```
+
+## E2E Tests
+
+No special handling needed - Pinia works normally.
+
+<!--
+Source references:
+- https://pinia.vuejs.org/cookbook/testing.html
+-->