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/vitest/references/core-expect.md

@@ -0,0 +1,219 @@
+---
+name: expect-api
+description: Assertions with matchers, asymmetric matchers, and custom matchers
+---
+
+# Expect API
+
+Vitest uses Chai assertions with Jest-compatible API.
+
+## Basic Assertions
+
+```ts
+import { expect, test } from 'vitest'
+
+test('assertions', () => {
+  // Equality
+  expect(1 + 1).toBe(2)              // Strict equality (===)
+  expect({ a: 1 }).toEqual({ a: 1 }) // Deep equality
+
+  // Truthiness
+  expect(true).toBeTruthy()
+  expect(false).toBeFalsy()
+  expect(null).toBeNull()
+  expect(undefined).toBeUndefined()
+  expect('value').toBeDefined()
+
+  // Numbers
+  expect(10).toBeGreaterThan(5)
+  expect(10).toBeGreaterThanOrEqual(10)
+  expect(5).toBeLessThan(10)
+  expect(0.1 + 0.2).toBeCloseTo(0.3, 5)
+
+  // Strings
+  expect('hello world').toMatch(/world/)
+  expect('hello').toContain('ell')
+
+  // Arrays
+  expect([1, 2, 3]).toContain(2)
+  expect([{ a: 1 }]).toContainEqual({ a: 1 })
+  expect([1, 2, 3]).toHaveLength(3)
+
+  // Objects
+  expect({ a: 1, b: 2 }).toHaveProperty('a')
+  expect({ a: 1, b: 2 }).toHaveProperty('a', 1)
+  expect({ a: { b: 1 } }).toHaveProperty('a.b', 1)
+  expect({ a: 1 }).toMatchObject({ a: 1 })
+
+  // Types
+  expect('string').toBeTypeOf('string')
+  expect(new Date()).toBeInstanceOf(Date)
+})
+```
+
+## Negation
+
+```ts
+expect(1).not.toBe(2)
+expect({ a: 1 }).not.toEqual({ a: 2 })
+```
+
+## Error Assertions
+
+```ts
+// Sync errors - wrap in function
+expect(() => throwError()).toThrow()
+expect(() => throwError()).toThrow('message')
+expect(() => throwError()).toThrow(/pattern/)
+expect(() => throwError()).toThrow(CustomError)
+
+// Async errors - use rejects
+await expect(asyncThrow()).rejects.toThrow('error')
+```
+
+## Promise Assertions
+
+```ts
+// Resolves
+await expect(Promise.resolve(1)).resolves.toBe(1)
+await expect(fetchData()).resolves.toEqual({ data: true })
+
+// Rejects
+await expect(Promise.reject('error')).rejects.toBe('error')
+await expect(failingFetch()).rejects.toThrow()
+```
+
+## Spy/Mock Assertions
+
+```ts
+const fn = vi.fn()
+fn('arg1', 'arg2')
+fn('arg3')
+
+expect(fn).toHaveBeenCalled()
+expect(fn).toHaveBeenCalledTimes(2)
+expect(fn).toHaveBeenCalledWith('arg1', 'arg2')
+expect(fn).toHaveBeenLastCalledWith('arg3')
+expect(fn).toHaveBeenNthCalledWith(1, 'arg1', 'arg2')
+
+expect(fn).toHaveReturned()
+expect(fn).toHaveReturnedWith(value)
+```
+
+## Asymmetric Matchers
+
+Use inside `toEqual`, `toHaveBeenCalledWith`, etc:
+
+```ts
+expect({ id: 1, name: 'test' }).toEqual({
+  id: expect.any(Number),
+  name: expect.any(String),
+})
+
+expect({ a: 1, b: 2, c: 3 }).toEqual(
+  expect.objectContaining({ a: 1 })
+)
+
+expect([1, 2, 3, 4]).toEqual(
+  expect.arrayContaining([1, 3])
+)
+
+expect('hello world').toEqual(
+  expect.stringContaining('world')
+)
+
+expect('hello world').toEqual(
+  expect.stringMatching(/world$/)
+)
+
+expect({ value: null }).toEqual({
+  value: expect.anything() // Matches anything except null/undefined
+})
+
+// Negate with expect.not
+expect([1, 2]).toEqual(
+  expect.not.arrayContaining([3])
+)
+```
+
+## Soft Assertions
+
+Continue test after failure:
+
+```ts
+expect.soft(1).toBe(2) // Marks test failed but continues
+expect.soft(2).toBe(3) // Also runs
+// All failures reported at end
+```
+
+## Poll Assertions
+
+Retry until passes:
+
+```ts
+await expect.poll(() => fetchStatus()).toBe('ready')
+
+await expect.poll(
+  () => document.querySelector('.element'),
+  { interval: 100, timeout: 5000 }
+).toBeTruthy()
+```
+
+## Assertion Count
+
+```ts
+test('async assertions', async () => {
+  expect.assertions(2) // Exactly 2 assertions must run
+  
+  await doAsync((data) => {
+    expect(data).toBeDefined()
+    expect(data.id).toBe(1)
+  })
+})
+
+test('at least one', () => {
+  expect.hasAssertions() // At least 1 assertion must run
+})
+```
+
+## Extending Matchers
+
+```ts
+expect.extend({
+  toBeWithinRange(received, floor, ceiling) {
+    const pass = received >= floor && received <= ceiling
+    return {
+      pass,
+      message: () => 
+        `expected ${received} to be within range ${floor} - ${ceiling}`,
+    }
+  },
+})
+
+test('custom matcher', () => {
+  expect(100).toBeWithinRange(90, 110)
+})
+```
+
+## Snapshot Assertions
+
+```ts
+expect(data).toMatchSnapshot()
+expect(data).toMatchInlineSnapshot(`{ "id": 1 }`)
+await expect(result).toMatchFileSnapshot('./expected.json')
+
+expect(() => throw new Error('fail')).toThrowErrorMatchingSnapshot()
+```
+
+## Key Points
+
+- Use `toBe` for primitives, `toEqual` for objects/arrays
+- `toStrictEqual` checks undefined properties and array sparseness
+- Always `await` async assertions (`resolves`, `rejects`, `poll`)
+- Use context's `expect` in concurrent tests for correct tracking
+- `toThrow` requires wrapping sync code in a function
+
+<!-- 
+Source references:
+- https://vitest.dev/api/expect.html
+-->