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/features-snapshots.md

@@ -0,0 +1,207 @@
+---
+name: snapshot-testing
+description: Snapshot testing with file, inline, and file snapshots
+---
+
+# Snapshot Testing
+
+Snapshot tests capture output and compare against stored references.
+
+## Basic Snapshot
+
+```ts
+import { expect, test } from 'vitest'
+
+test('snapshot', () => {
+  const result = generateOutput()
+  expect(result).toMatchSnapshot()
+})
+```
+
+First run creates `.snap` file:
+
+```js
+// __snapshots__/test.spec.ts.snap
+exports['snapshot 1'] = `
+{
+  "id": 1,
+  "name": "test"
+}
+`
+```
+
+## Inline Snapshots
+
+Stored directly in test file:
+
+```ts
+test('inline snapshot', () => {
+  const data = { foo: 'bar' }
+  expect(data).toMatchInlineSnapshot()
+})
+```
+
+Vitest updates the test file:
+
+```ts
+test('inline snapshot', () => {
+  const data = { foo: 'bar' }
+  expect(data).toMatchInlineSnapshot(`
+    {
+      "foo": "bar",
+    }
+  `)
+})
+```
+
+## File Snapshots
+
+Compare against explicit file:
+
+```ts
+test('render html', async () => {
+  const html = renderComponent()
+  await expect(html).toMatchFileSnapshot('./expected/component.html')
+})
+```
+
+## Snapshot Hints
+
+Add descriptive hints:
+
+```ts
+test('multiple snapshots', () => {
+  expect(header).toMatchSnapshot('header')
+  expect(body).toMatchSnapshot('body content')
+  expect(footer).toMatchSnapshot('footer')
+})
+```
+
+## Object Shape Matching
+
+Match partial structure:
+
+```ts
+test('shape snapshot', () => {
+  const data = { 
+    id: Math.random(), 
+    created: new Date(),
+    name: 'test' 
+  }
+  
+  expect(data).toMatchSnapshot({
+    id: expect.any(Number),
+    created: expect.any(Date),
+  })
+})
+```
+
+## Error Snapshots
+
+```ts
+test('error message', () => {
+  expect(() => {
+    throw new Error('Something went wrong')
+  }).toThrowErrorMatchingSnapshot()
+})
+
+test('inline error', () => {
+  expect(() => {
+    throw new Error('Bad input')
+  }).toThrowErrorMatchingInlineSnapshot(`[Error: Bad input]`)
+})
+```
+
+## Updating Snapshots
+
+```bash
+# Update all snapshots
+vitest -u
+vitest --update
+
+# In watch mode, press 'u' to update failed snapshots
+```
+
+## Custom Serializers
+
+Add custom snapshot formatting:
+
+```ts
+expect.addSnapshotSerializer({
+  test(val) {
+    return val && typeof val.toJSON === 'function'
+  },
+  serialize(val, config, indentation, depth, refs, printer) {
+    return printer(val.toJSON(), config, indentation, depth, refs)
+  },
+})
+```
+
+Or via config:
+
+```ts
+// vitest.config.ts
+defineConfig({
+  test: {
+    snapshotSerializers: ['./my-serializer.ts'],
+  },
+})
+```
+
+## Snapshot Format Options
+
+```ts
+defineConfig({
+  test: {
+    snapshotFormat: {
+      printBasicPrototype: false, // Don't print Array/Object prototypes
+      escapeString: false,
+    },
+  },
+})
+```
+
+## Concurrent Test Snapshots
+
+Use context's expect:
+
+```ts
+test.concurrent('concurrent 1', async ({ expect }) => {
+  expect(await getData()).toMatchSnapshot()
+})
+
+test.concurrent('concurrent 2', async ({ expect }) => {
+  expect(await getOther()).toMatchSnapshot()
+})
+```
+
+## Snapshot File Location
+
+Default: `__snapshots__/<test-file>.snap`
+
+Customize:
+
+```ts
+defineConfig({
+  test: {
+    resolveSnapshotPath: (testPath, snapExtension) => {
+      return testPath.replace('__tests__', '__snapshots__') + snapExtension
+    },
+  },
+})
+```
+
+## Key Points
+
+- Commit snapshot files to version control
+- Review snapshot changes in code review
+- Use hints for multiple snapshots in one test
+- Use `toMatchFileSnapshot` for large outputs (HTML, JSON)
+- Inline snapshots auto-update in test file
+- Use context's `expect` for concurrent tests
+
+<!-- 
+Source references:
+- https://vitest.dev/guide/snapshot.html
+- https://vitest.dev/api/expect.html#tomatchsnapshot
+-->