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/useRouteParams.md

@@ -0,0 +1,38 @@
+---
+category: '@Router'
+---
+
+# useRouteParams
+
+Shorthand for a reactive `route.params`.
+
+## Usage
+
+```ts
+import { useRouteParams } from '@vueuse/router'
+
+const userId = useRouteParams('userId')
+
+const userId = useRouteParams('userId', '-1') // or with a default value
+
+const userId = useRouteParams('page', '1', { transform: Number }) // or transforming value
+
+console.log(userId.value) // route.params.userId
+userId.value = '100' // router.replace({ params: { userId: '100' } })
+```
+
+## Type Declarations
+
+```ts
+export declare function useRouteParams(
+  name: string,
+): Ref<null | string | string[]>
+export declare function useRouteParams<
+  T extends RouteParamValueRaw = RouteParamValueRaw,
+  K = T,
+>(
+  name: string,
+  defaultValue?: MaybeRefOrGetter<T>,
+  options?: ReactiveRouteOptionsWithTransform<T, K>,
+): Ref<K>
+```