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/vueuse-functions/references/usePageLeave.md

@@ -0,0 +1,42 @@
+---
+category: Sensors
+---
+
+# usePageLeave
+
+Reactive state to show whether the mouse leaves the page.
+
+## Usage
+
+```ts
+import { usePageLeave } from '@vueuse/core'
+
+const isLeft = usePageLeave()
+```
+
+## Component Usage
+
+```vue
+<template>
+  <UsePageLeave v-slot="{ isLeft }">
+    Has Left Page: {{ isLeft }}
+  </UsePageLeave>
+</template>
+```
+
+## Type Declarations
+
+```ts
+/**
+ * Reactive state to show whether mouse leaves the page.
+ *
+ * @see https://vueuse.org/usePageLeave
+ * @param options
+ *
+ * @__NO_SIDE_EFFECTS__
+ */
+export declare function usePageLeave(
+  options?: ConfigurableWindow,
+): ShallowRef<boolean, boolean>
+export type UsePageLeaveReturn = ReturnType<typeof usePageLeave>
+```