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/useSpeechSynthesis.md

@@ -0,0 +1,101 @@
+---
+category: Sensors
+---
+
+# useSpeechSynthesis
+
+Reactive [SpeechSynthesis](https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesis).
+
+> [Can I use?](https://caniuse.com/mdn-api_speechsynthesis)
+
+## Usage
+
+```ts
+import { useSpeechSynthesis } from '@vueuse/core'
+
+const {
+  isSupported,
+  isPlaying,
+  status,
+  voiceInfo,
+  utterance,
+  error,
+  stop,
+  toggle,
+  speak,
+} = useSpeechSynthesis()
+```
+
+### Options
+
+The following shows the default values of the options, they will be directly passed to [SpeechSynthesis API](https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesis).
+
+```ts
+import { useSpeechSynthesis } from '@vueuse/core'
+// ---cut---
+useSpeechSynthesis({
+  lang: 'en-US',
+  pitch: 1,
+  rate: 1,
+  volume: 1,
+})
+```
+
+## Type Declarations
+
+```ts
+export type UseSpeechSynthesisStatus = "init" | "play" | "pause" | "end"
+export interface UseSpeechSynthesisOptions extends ConfigurableWindow {
+  /**
+   * Language for SpeechSynthesis
+   *
+   * @default 'en-US'
+   */
+  lang?: MaybeRefOrGetter<string>
+  /**
+   * Gets and sets the pitch at which the utterance will be spoken at.
+   *
+   * @default 1
+   */
+  pitch?: MaybeRefOrGetter<SpeechSynthesisUtterance["pitch"]>
+  /**
+   * Gets and sets the speed at which the utterance will be spoken at.
+   *
+   * @default 1
+   */
+  rate?: MaybeRefOrGetter<SpeechSynthesisUtterance["rate"]>
+  /**
+   * Gets and sets the voice that will be used to speak the utterance.
+   */
+  voice?: MaybeRef<SpeechSynthesisVoice>
+  /**
+   * Gets and sets the volume that the utterance will be spoken at.
+   *
+   * @default 1
+   */
+  volume?: MaybeRefOrGetter<SpeechSynthesisUtterance["volume"]>
+  /**
+   * Callback function that is called when the boundary event is triggered.
+   */
+  onBoundary?: (event: SpeechSynthesisEvent) => void
+}
+export interface UseSpeechSynthesisReturn extends Supportable {
+  isPlaying: ShallowRef<boolean>
+  status: ShallowRef<UseSpeechSynthesisStatus>
+  utterance: ComputedRef<SpeechSynthesisUtterance>
+  error: ShallowRef<SpeechSynthesisErrorEvent | undefined>
+  stop: () => void
+  toggle: (value?: boolean) => void
+  speak: () => void
+}
+/**
+ * Reactive SpeechSynthesis.
+ *
+ * @see https://vueuse.org/useSpeechSynthesis
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesis SpeechSynthesis
+ */
+export declare function useSpeechSynthesis(
+  text: MaybeRefOrGetter<string>,
+  options?: UseSpeechSynthesisOptions,
+): UseSpeechSynthesisReturn
+```