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/usePrecision.md

@@ -0,0 +1,49 @@
+---
+category: '@Math'
+---
+
+# usePrecision
+
+Reactively set the precision of a number.
+
+## Usage
+
+```ts
+import { usePrecision } from '@vueuse/math'
+
+const value = ref(3.1415)
+const result = usePrecision(value, 2) // 3.14
+
+const ceilResult = usePrecision(value, 2, {
+  math: 'ceil'
+}) // 3.15
+
+const floorResult = usePrecision(value, 3, {
+  math: 'floor'
+}) // 3.141
+```
+
+## Type Declarations
+
+```ts
+export interface UsePrecisionOptions {
+  /**
+   * Method to use for rounding
+   *
+   * @default 'round'
+   */
+  math?: "floor" | "ceil" | "round"
+}
+/**
+ * Reactively set the precision of a number.
+ *
+ * @see https://vueuse.org/usePrecision
+ *
+ * @__NO_SIDE_EFFECTS__
+ */
+export declare function usePrecision(
+  value: MaybeRefOrGetter<number>,
+  digits: MaybeRefOrGetter<number>,
+  options?: MaybeRefOrGetter<UsePrecisionOptions>,
+): ComputedRef<number>
+```