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/refManualReset.md

@@ -0,0 +1,44 @@
+---
+category: Reactivity
+---
+
+# refManualReset
+
+Create a ref with manual reset functionality.
+
+## Usage
+
+```ts
+import { refManualReset } from '@vueuse/core'
+
+const message = refManualReset('default message')
+
+message.value = 'message has set'
+
+message.reset()
+
+console.log(message.value) // 'default message'
+```
+
+## Type Declarations
+
+```ts
+/**
+ * Define the shape of a ref that supports manual reset functionality.
+ *
+ * This interface extends the standard `Ref` type from Vue and adds a `reset` method.
+ * The `reset` method allows the ref to be manually reset to its default value.
+ */
+export interface ManualResetRefReturn<T> extends Ref<T> {
+  reset: Fn
+}
+/**
+ * Create a ref with manual reset functionality.
+ *
+ * @see https://vueuse.org/refManualReset
+ * @param defaultValue The value which will be set.
+ */
+export declare function refManualReset<T>(
+  defaultValue: MaybeRefOrGetter<T>,
+): ManualResetRefReturn<T>
+```