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/useClamp.md

@@ -0,0 +1,85 @@
+---
+category: '@Math'
+---
+
+# useClamp
+
+Reactively clamp a value between two other values.
+
+## Usage
+
+```ts
+import { useClamp } from '@vueuse/math'
+
+const min = shallowRef(0)
+const max = shallowRef(10)
+const value = useClamp(0, min, max)
+```
+
+### Writable Ref
+
+When you pass a mutable `ref`, the returned value is a **writable computed** that clamps values when setting:
+
+```ts
+import { useClamp } from '@vueuse/math'
+
+const number = shallowRef(0)
+const clamped = useClamp(number, 0, 10)
+
+clamped.value = 15 // clamped.value will be 10
+clamped.value = -5 // clamped.value will be 0
+```
+
+### Read-only Mode
+
+When you pass a getter function or readonly ref, the returned value is a read-only computed:
+
+```ts
+import { useClamp } from '@vueuse/math'
+
+const value = ref(5)
+const clamped = useClamp(() => value.value * 2, 0, 10)
+
+// clamped.value is computed from the getter
+```
+
+### Reactive Bounds
+
+All arguments (value, min, max) can be reactive:
+
+```ts
+import { useClamp } from '@vueuse/math'
+
+const value = shallowRef(5)
+const min = shallowRef(0)
+const max = shallowRef(10)
+
+const clamped = useClamp(value, min, max)
+
+max.value = 3 // clamped.value automatically becomes 3
+```
+
+## Type Declarations
+
+```ts
+/**
+ * Reactively clamp a value between two other values.
+ *
+ * @see https://vueuse.org/useClamp
+ * @param value number
+ * @param min
+ * @param max
+ *
+ * @__NO_SIDE_EFFECTS__
+ */
+export declare function useClamp(
+  value: ReadonlyRefOrGetter<number>,
+  min: MaybeRefOrGetter<number>,
+  max: MaybeRefOrGetter<number>,
+): ComputedRef<number>
+export declare function useClamp(
+  value: MaybeRefOrGetter<number>,
+  min: MaybeRefOrGetter<number>,
+  max: MaybeRefOrGetter<number>,
+): Ref<number>
+```