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/refDebounced.md

@@ -0,0 +1,81 @@
+---
+category: Reactivity
+alias: useDebounce, debouncedRef
+---
+
+# refDebounced
+
+Debounce execution of a ref value.
+
+## Usage
+
+```ts {5}
+import { refDebounced } from '@vueuse/core'
+import { shallowRef } from 'vue'
+
+const input = shallowRef('foo')
+const debounced = refDebounced(input, 1000)
+
+input.value = 'bar'
+console.log(debounced.value) // 'foo'
+
+await sleep(1100)
+
+console.log(debounced.value) // 'bar'
+// ---cut-after---
+function sleep(ms: number) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
+```
+
+An example with object ref.
+
+```js
+import { refDebounced } from '@vueuse/core'
+import { shallowRef } from 'vue'
+
+const data = shallowRef({
+  name: 'foo',
+  age: 18,
+})
+const debounced = refDebounced(data, 1000)
+
+function update() {
+  data.value = {
+    ...data.value,
+    name: 'bar',
+  }
+}
+
+console.log(debounced.value) // { name: 'foo', age: 18 }
+update()
+await sleep(1100)
+
+console.log(debounced.value) // { name: 'bar', age: 18 }
+```
+
+You can also pass an optional 3rd parameter including maxWait option. See `useDebounceFn` for details.
+
+## Recommended Reading
+
+- [**Debounce vs Throttle**: Definitive Visual Guide](https://kettanaito.com/blog/debounce-vs-throttle)
+
+## Type Declarations
+
+```ts
+export type RefDebouncedReturn<T = any> = Readonly<Ref<T>>
+/**
+ * Debounce updates of a ref.
+ *
+ * @return A new debounced ref.
+ */
+export declare function refDebounced<T>(
+  value: Ref<T>,
+  ms?: MaybeRefOrGetter<number>,
+  options?: DebounceFilterOptions,
+): RefDebouncedReturn<T>
+/** @deprecated use `refDebounced` instead */
+export declare const debouncedRef: typeof refDebounced
+/** @deprecated use `refDebounced` instead */
+export declare const useDebounce: typeof refDebounced
+```