docs: add advanced skills for Vitest, Pinia, and Vue built-ins

Add comprehensive reference documentation for:
- Vitest: environments, projects/workspaces, type testing, vi utilities
- Pinia: HMR, Nuxt integration, SSR setup
- Vue: built-in components (Transition, Teleport, Suspense, KeepAlive) and advanced directives

.agents/skills/vueuse-functions/references/useScrollLock.md

@@ -0,0 +1,66 @@
+---
+category: Sensors
+---
+
+# useScrollLock
+
+Lock scrolling of the element.
+
+## Usage
+
+```vue
+<script setup lang="ts">
+import { useScrollLock } from '@vueuse/core'
+import { useTemplateRef } from 'vue'
+
+const el = useTemplateRef('el')
+const isLocked = useScrollLock(el)
+
+isLocked.value = true // lock
+isLocked.value = false // unlock
+</script>
+
+<template>
+  <div ref="el" />
+</template>
+```
+
+## Directive Usage
+
+```vue
+<script setup lang="ts">
+import { vScrollLock } from '@vueuse/components'
+
+const data = ref([1, 2, 3, 4, 5, 6])
+const isLocked = ref(false)
+const toggleLock = useToggle(isLocked)
+</script>
+
+<template>
+  <div v-scroll-lock="isLocked">
+    <div v-for="item in data" :key="item">
+      {{ item }}
+    </div>
+  </div>
+  <button @click="toggleLock()">
+    Toggle lock state
+  </button>
+</template>
+```
+
+## Type Declarations
+
+```ts
+/**
+ * Lock scrolling of the element.
+ *
+ * @see https://vueuse.org/useScrollLock
+ * @param element
+ */
+export declare function useScrollLock(
+  element: MaybeRefOrGetter<
+    HTMLElement | SVGElement | Window | Document | null | undefined
+  >,
+  initialState?: boolean,
+): WritableComputedRef<boolean, boolean>
+```