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/useActiveElement.md

@@ -0,0 +1,65 @@
+---
+category: Elements
+---
+
+# useActiveElement
+
+Reactive `document.activeElement`
+
+## Usage
+
+```vue
+<script setup lang="ts">
+import { useActiveElement } from '@vueuse/core'
+import { watch } from 'vue'
+
+const activeElement = useActiveElement()
+
+watch(activeElement, (el) => {
+  console.log('focus changed to', el)
+})
+</script>
+```
+
+## Component Usage
+
+```vue
+<template>
+  <UseActiveElement v-slot="{ element }">
+    Active element is {{ element?.dataset.id }}
+  </UseActiveElement>
+</template>
+```
+
+## Type Declarations
+
+```ts
+export interface UseActiveElementOptions
+  extends ConfigurableWindow,
+    ConfigurableDocumentOrShadowRoot {
+  /**
+   * Search active element deeply inside shadow dom
+   *
+   * @default true
+   */
+  deep?: boolean
+  /**
+   * Track active element when it's removed from the DOM
+   * Using a MutationObserver under the hood
+   * @default false
+   */
+  triggerOnRemoval?: boolean
+}
+/**
+ * Reactive `document.activeElement`
+ *
+ * @see https://vueuse.org/useActiveElement
+ * @param options
+ *
+ * @__NO_SIDE_EFFECTS__
+ */
+export declare function useActiveElement<T extends HTMLElement>(
+  options?: UseActiveElementOptions,
+): ShallowRef<T | null | undefined, T | null | undefined>
+export type UseActiveElementReturn = ReturnType<typeof useActiveElement>
+```