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/tsdown/references/option-shims.md

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+# Shims
+
+Add compatibility between ESM and CommonJS module systems.
+
+## Overview
+
+Shims provide small pieces of code that bridge the gap between CommonJS (CJS) and ECMAScript Modules (ESM), enabling cross-module-system compatibility.
+
+## What Shims Provide
+
+### ESM Output (when enabled)
+
+With `shims: true`, adds CommonJS variables to ESM:
+
+- `__dirname` - Current directory path
+- `__filename` - Current file path
+
+### ESM Output (automatic)
+
+Always added when using `require` in ESM on Node.js:
+
+- `require` function via `createRequire(import.meta.url)`
+
+### CJS Output (automatic)
+
+Always added to CommonJS output:
+
+- `import.meta.url`
+- `import.meta.dirname`
+- `import.meta.filename`
+
+## Usage
+
+### CLI
+
+```bash
+tsdown --shims
+```
+
+### Config File
+
+```ts
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: ['esm'],
+  shims: true,
+})
+```
+
+## Generated Code
+
+### ESM with Shims
+
+**Source:**
+```ts
+console.log(__dirname)
+console.log(__filename)
+```
+
+**Output (shims: true):**
+```js
+import { fileURLToPath } from 'node:url'
+import { dirname } from 'node:path'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = dirname(__filename)
+
+console.log(__dirname)
+console.log(__filename)
+```
+
+### ESM with require
+
+**Source:**
+```ts
+const mod = require('some-module')
+```
+
+**Output (automatic on Node.js):**
+```js
+import { createRequire } from 'node:module'
+const require = createRequire(import.meta.url)
+
+const mod = require('some-module')
+```
+
+### CJS with import.meta
+
+**Source:**
+```ts
+console.log(import.meta.url)
+console.log(import.meta.dirname)
+```
+
+**Output (automatic):**
+```js
+const import_meta = {
+  url: require('url').pathToFileURL(__filename).toString(),
+  dirname: __dirname,
+  filename: __filename
+}
+
+console.log(import_meta.url)
+console.log(import_meta.dirname)
+```
+
+## Common Patterns
+
+### Node.js CLI Tool
+
+```ts
+export default defineConfig({
+  entry: ['src/cli.ts'],
+  format: ['esm'],
+  platform: 'node',
+  shims: true,  // Add __dirname, __filename
+})
+```
+
+### Dual Format Library
+
+```ts
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: ['esm', 'cjs'],
+  platform: 'node',
+  shims: true,  // ESM gets __dirname/__filename
+                // CJS gets import.meta.* (automatic)
+})
+```
+
+### Server-Side Code
+
+```ts
+export default defineConfig({
+  entry: ['src/server.ts'],
+  format: ['esm'],
+  platform: 'node',
+  shims: true,
+  external: [/.*/],  // External all deps
+})
+```
+
+### File System Operations
+
+```ts
+// Source code
+import { readFileSync } from 'fs'
+import { join } from 'path'
+
+// Read file relative to current module
+const content = readFileSync(join(__dirname, 'data.json'), 'utf-8')
+```
+
+```ts
+// tsdown config
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: ['esm'],
+  shims: true,  // Enables __dirname
+})
+```
+
+## When to Use Shims
+
+### Use `shims: true` when:
+
+- ✅ Building Node.js tools/CLIs
+- ✅ Code uses `__dirname` or `__filename`
+- ✅ Need file system operations relative to module
+- ✅ Migrating from CommonJS to ESM
+- ✅ Need cross-format compatibility
+
+### Don't need shims when:
+
+- ❌ Browser-only code
+- ❌ No file system operations
+- ❌ Using only `import.meta.url`
+- ❌ Pure ESM without CJS variables
+
+## Performance Impact
+
+### Runtime Overhead
+
+Shims add minimal runtime overhead:
+
+```js
+// Added to output when shims enabled
+import { fileURLToPath } from 'node:url'
+import { dirname } from 'node:path'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = dirname(__filename)
+```
+
+### Tree Shaking
+
+If `__dirname` or `__filename` are not used, they're automatically removed during bundling (no overhead).
+
+## Platform Considerations
+
+### Node.js Platform
+
+```ts
+export default defineConfig({
+  platform: 'node',
+  format: ['esm'],
+  shims: true,  // Recommended for Node.js
+})
+```
+
+- `require` shim added automatically
+- `__dirname` and `__filename` available with `shims: true`
+
+### Browser Platform
+
+```ts
+export default defineConfig({
+  platform: 'browser',
+  format: ['esm'],
+  shims: false,  // Not needed for browser
+})
+```
+
+- Shims not needed (no Node.js variables)
+- Will cause warnings if Node.js APIs used
+
+### Neutral Platform
+
+```ts
+export default defineConfig({
+  platform: 'neutral',
+  format: ['esm'],
+  shims: false,  // Avoid platform-specific code
+})
+```
+
+- Avoid shims for maximum portability
+
+## CLI Examples
+
+```bash
+# Enable shims
+tsdown --shims
+
+# ESM with shims for Node.js
+tsdown --format esm --platform node --shims
+
+# Dual format with shims
+tsdown --format esm --format cjs --shims
+```
+
+## Troubleshooting
+
+### `__dirname is not defined`
+
+Enable shims:
+
+```ts
+export default defineConfig({
+  shims: true,
+})
+```
+
+### `require is not defined` in ESM
+
+Automatic on Node.js platform. If not working:
+
+```ts
+export default defineConfig({
+  platform: 'node',  // Ensure Node.js platform
+})
+```
+
+### Import.meta not working in CJS
+
+Automatic - no configuration needed. If still failing, check output format:
+
+```ts
+export default defineConfig({
+  format: ['cjs'],  // Shims added automatically
+})
+```
+
+## Tips
+
+1. **Enable for Node.js tools** - Use `shims: true` for CLIs and servers
+2. **Skip for browsers** - Not needed for browser code
+3. **No overhead if unused** - Automatically tree-shaken
+4. **Automatic require shim** - No config needed for `require` in ESM
+5. **CJS shims automatic** - `import.meta.*` always available in CJS
+
+## Related Options
+
+- [Platform](option-platform.md) - Runtime environment
+- [Output Format](option-output-format.md) - Module formats
+- [Target](option-target.md) - Syntax transformations