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/unocss/references/preset-rem-to-px.md

@@ -0,0 +1,97 @@
+---
+name: preset-rem-to-px
+description: Convert rem units to px for utilities
+---
+
+# Preset Rem to Px
+
+Converts `rem` units to `px` in generated utilities.
+
+## Installation
+
+```ts
+import { defineConfig, presetRemToPx, presetWind3 } from 'unocss'
+
+export default defineConfig({
+  presets: [
+    presetWind3(),
+    presetRemToPx(),
+  ],
+})
+```
+
+## What It Does
+
+Transforms all rem values to px:
+
+```html
+<div class="p-4">
+```
+
+Without preset:
+```css
+.p-4 { padding: 1rem; }
+```
+
+With preset:
+```css
+.p-4 { padding: 16px; }
+```
+
+## Use Cases
+
+- Projects requiring pixel-perfect designs
+- Environments where rem doesn't work well
+- Consistency with pixel-based design systems
+- Email templates (better compatibility)
+
+## Options
+
+```ts
+presetRemToPx({
+  // Base font size for conversion (default: 16)
+  baseFontSize: 16,
+})
+```
+
+Custom base:
+
+```ts
+presetRemToPx({
+  baseFontSize: 14, // 1rem = 14px
+})
+```
+
+## With Preset Wind4
+
+**Note:** `presetRemToPx` is not needed with `preset-wind4`. Use the built-in processor instead:
+
+```ts
+import { createRemToPxProcessor } from '@unocss/preset-wind4/utils'
+
+export default defineConfig({
+  presets: [
+    presetWind4({
+      preflights: {
+        theme: {
+          process: createRemToPxProcessor(),
+        }
+      },
+    }),
+  ],
+  // Also apply to utilities
+  postprocess: [createRemToPxProcessor()],
+})
+```
+
+## Important Notes
+
+- Order matters: place after the preset that generates rem values
+- Affects all utilities with rem units
+- Theme values in rem are also converted
+
+<!-- 
+Source references:
+- https://unocss.dev/presets/rem-to-px
+- https://unocss.dev/presets/wind4
+-->