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/onElementRemoval.md

@@ -0,0 +1,64 @@
+---
+category: Sensors
+---
+
+# onElementRemoval
+
+Fires when the element or any element containing it is removed.
+
+## Usage
+
+```vue {13}
+<script setup lang="ts">
+import { onElementRemoval } from '@vueuse/core'
+import { shallowRef, useTemplateRef } from 'vue'
+
+const btnRef = useTemplateRef('btn')
+const btnState = shallowRef(true)
+const removedCount = shallowRef(0)
+
+function btnOnClick() {
+  btnState.value = !btnState.value
+}
+
+onElementRemoval(btnRef, () => ++removedCount.value)
+</script>
+
+<template>
+  <button
+    v-if="btnState"
+    @click="btnOnClick"
+  >
+    recreate me
+  </button>
+  <button
+    v-else
+    ref="btnRef"
+    @click="btnOnClick"
+  >
+    remove me
+  </button>
+  <b>removed times: {{ removedCount }}</b>
+</template>
+```
+
+## Type Declarations
+
+```ts
+export interface OnElementRemovalOptions
+  extends ConfigurableWindow,
+    ConfigurableDocumentOrShadowRoot,
+    WatchOptionsBase {}
+/**
+ * Fires when the element or any element containing it is removed.
+ *
+ * @param target
+ * @param callback
+ * @param options
+ */
+export declare function onElementRemoval(
+  target: MaybeElementRef,
+  callback: (mutationRecords: MutationRecord[]) => void,
+  options?: OnElementRemovalOptions,
+): Fn
+```