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-target.md

@@ -0,0 +1,208 @@
+# Target Environment
+
+Configure JavaScript syntax transformations for target environments.
+
+## Overview
+
+The `target` option controls which JavaScript features are downleveled (transformed to older syntax) for compatibility.
+
+**Important:** Only affects syntax transformations, not runtime polyfills.
+
+## Default Behavior
+
+tsdown auto-reads from `package.json`:
+
+```json
+// package.json
+{
+  "engines": {
+    "node": ">=18.0.0"
+  }
+}
+```
+
+Automatically sets `target` to `node18.0.0`.
+
+If no `engines.node` field exists, behaves as if `target: false` (no transformations).
+
+## Disabling Transformations
+
+Set to `false` to preserve modern syntax:
+
+```ts
+export default defineConfig({
+  target: false,
+})
+```
+
+**Result:**
+- No JavaScript downleveling
+- Modern features preserved (optional chaining `?.`, nullish coalescing `??`, etc.)
+
+**Use when:**
+- Targeting modern environments
+- Handling transformations elsewhere
+- Building libraries for further processing
+
+## Setting Target
+
+### CLI
+
+```bash
+# Single target
+tsdown --target es2020
+tsdown --target node20
+
+# Multiple targets
+tsdown --target chrome100 --target node20.18
+
+# Disable
+tsdown --no-target
+```
+
+### Config File
+
+```ts
+export default defineConfig({
+  entry: ['src/index.ts'],
+  target: 'es2020',
+})
+```
+
+### Multiple Targets
+
+```ts
+export default defineConfig({
+  entry: ['src/index.ts'],
+  target: ['chrome100', 'safari15', 'node18'],
+})
+```
+
+## Supported Targets
+
+### ECMAScript Versions
+
+- `es2015`, `es2016`, `es2017`, `es2018`, `es2019`, `es2020`, `es2021`, `es2022`, `es2023`, `esnext`
+
+### Browser Versions
+
+- `chrome100`, `safari18`, `firefox110`, `edge100`, etc.
+
+### Node.js Versions
+
+- `node16`, `node18`, `node20`, `node20.18`, etc.
+
+## Examples
+
+### Modern Browsers
+
+```ts
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: ['esm'],
+  target: ['chrome100', 'safari15', 'firefox100'],
+})
+```
+
+### Node.js Library
+
+```ts
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: ['esm', 'cjs'],
+  target: 'node18',
+})
+```
+
+### Legacy Support
+
+```ts
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: ['esm'],
+  target: 'es2015',  // Maximum compatibility
+})
+```
+
+### Per-Format Targets
+
+```ts
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: {
+    esm: {
+      target: 'es2020',
+    },
+    cjs: {
+      target: 'node16',
+    },
+  },
+})
+```
+
+## Decorators
+
+### Legacy Decorators (Stage 2)
+
+Enable in `tsconfig.json`:
+
+```json
+{
+  "compilerOptions": {
+    "experimentalDecorators": true
+  }
+}
+```
+
+### Stage 3 Decorators
+
+**Not currently supported** by tsdown/Rolldown/Oxc.
+
+See [oxc issue #9170](https://github.com/oxc-project/oxc/issues/9170).
+
+## Common Patterns
+
+### Universal Library
+
+```ts
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: ['esm', 'cjs'],
+  target: 'es2020',  // Wide compatibility
+})
+```
+
+### Modern-Only Library
+
+```ts
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: ['esm'],
+  target: false,  // No transformations
+})
+```
+
+### Browser Component
+
+```ts
+export default defineConfig({
+  entry: ['src/index.tsx'],
+  format: ['esm'],
+  target: ['chrome100', 'safari15', 'firefox100'],
+  platform: 'browser',
+})
+```
+
+## Tips
+
+1. **Let tsdown auto-detect** from package.json when possible
+2. **Use `false`** for modern-only builds
+3. **Specify multiple targets** for broader compatibility
+4. **Use legacy decorators** with `experimentalDecorators`
+6. **Test output** in target environments
+
+## Related Options
+
+- [Platform](option-platform.md) - Runtime environment
+- [Output Format](option-output-format.md) - Module formats
+- [Minification](option-minification.md) - Code optimization