feat: Complete fleet — 94 skills across 10+ domains

Pulled ALL skills from 15 source repositories:
- anthropics/skills: 16 (docs, design, MCP, testing)
- obra/superpowers: 14 (TDD, debugging, agents, planning)
- coreyhaines31/marketingskills: 25 (marketing, CRO, SEO, growth)
- better-auth/skills: 5 (auth patterns)
- vercel-labs/agent-skills: 5 (React, design, Vercel)
- antfu/skills: 16 (Vue, Vite, Vitest, pnpm, Turborepo)
- Plus 13 individual skills from various repos

Mosaic Stack is not limited to coding — the Orchestrator and
subagents serve coding, business, design, marketing, writing,
logistics, analysis, and more.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/vueuse-functions/references/useInterval.md

@@ -0,0 +1,69 @@
+---
+category: Animation
+---
+
+# useInterval
+
+Reactive counter increases on every interval
+
+## Usage
+
+```ts
+import { useInterval } from '@vueuse/core'
+
+// count will increase every 200ms
+const counter = useInterval(200)
+```
+
+```ts
+import { useInterval } from '@vueuse/core'
+// ---cut---
+const { counter, reset, pause, resume } = useInterval(200, {
+  controls: true
+})
+```
+
+## Type Declarations
+
+```ts
+export interface UseIntervalOptions<Controls extends boolean> {
+  /**
+   * Expose more controls
+   *
+   * @default false
+   */
+  controls?: Controls
+  /**
+   * Execute the update immediately on calling
+   *
+   * @default true
+   */
+  immediate?: boolean
+  /**
+   * Callback on every interval
+   */
+  callback?: (count: number) => void
+}
+export interface UseIntervalControls {
+  counter: ShallowRef<number>
+  reset: () => void
+}
+export type UseIntervalReturn =
+  | Readonly<ShallowRef<number>>
+  | Readonly<UseIntervalControls & Pausable>
+/**
+ * Reactive counter increases on every interval
+ *
+ * @see https://vueuse.org/useInterval
+ * @param interval
+ * @param options
+ */
+export declare function useInterval(
+  interval?: MaybeRefOrGetter<number>,
+  options?: UseIntervalOptions<false>,
+): Readonly<ShallowRef<number>>
+export declare function useInterval(
+  interval: MaybeRefOrGetter<number>,
+  options: UseIntervalOptions<true>,
+): Readonly<UseIntervalControls & Pausable>
+```