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/watchPausable.md

@@ -0,0 +1,86 @@
+---
+category: Watch
+alias: pausableWatch
+---
+
+# watchPausable
+
+Pausable watch
+
+::: info
+This function will be removed in future version.
+:::
+
+::: tip
+
+[Pausable Watcher](https://vuejs.org/api/reactivity-core.html#watch) has been added to Vue [since 3.5](https://github.com/vuejs/core/pull/9651), use `const { stop, pause, resume } = watch(watchSource, callback)` instead.
+
+:::
+
+## Usage
+
+Use as normal the `watch`, but return extra `pause()` and `resume()` functions to control.
+
+```ts
+import { watchPausable } from '@vueuse/core'
+import { nextTick, shallowRef } from 'vue'
+
+const source = shallowRef('foo')
+
+const { stop, pause, resume } = watchPausable(
+  source,
+  v => console.log(`Changed to ${v}!`),
+)
+
+source.value = 'bar'
+await nextTick() // Changed to bar!
+
+pause()
+
+source.value = 'foobar'
+await nextTick() // (nothing happend)
+
+resume()
+
+source.value = 'hello'
+await nextTick() // Changed to hello!
+```
+
+## Type Declarations
+
+```ts
+export interface WatchPausableReturn extends Pausable {
+  stop: WatchStopHandle
+}
+export type WatchPausableOptions<Immediate> =
+  WatchWithFilterOptions<Immediate> & PausableFilterOptions
+/** @deprecated Use Vue's built-in `watch` instead. This function will be removed in future version. */
+export declare function watchPausable<
+  T extends Readonly<MultiWatchSources>,
+  Immediate extends Readonly<boolean> = false,
+>(
+  sources: [...T],
+  cb: WatchCallback<MapSources<T>, MapOldSources<T, Immediate>>,
+  options?: WatchPausableOptions<Immediate>,
+): WatchPausableReturn
+/** @deprecated Use Vue's built-in `watch` instead. This function will be removed in future version. */
+export declare function watchPausable<
+  T,
+  Immediate extends Readonly<boolean> = false,
+>(
+  source: WatchSource<T>,
+  cb: WatchCallback<T, Immediate extends true ? T | undefined : T>,
+  options?: WatchPausableOptions<Immediate>,
+): WatchPausableReturn
+/** @deprecated Use Vue's built-in `watch` instead. This function will be removed in future version. */
+export declare function watchPausable<
+  T extends object,
+  Immediate extends Readonly<boolean> = false,
+>(
+  source: T,
+  cb: WatchCallback<T, Immediate extends true ? T | undefined : T>,
+  options?: WatchPausableOptions<Immediate>,
+): WatchPausableReturn
+/** @deprecated Use Vue's built-in `watch` instead. This function will be removed in future version. */
+export declare const pausableWatch: typeof watchPausable
+```