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/useToString.md

@@ -0,0 +1,34 @@
+---
+category: Utilities
+---
+
+# useToString
+
+Reactively convert a ref to string.
+
+## Usage
+
+```ts
+import { useToString } from '@vueuse/core'
+import { shallowRef } from 'vue'
+
+const number = shallowRef(3.14)
+const str = useToString(number)
+
+str.value // '3.14'
+```
+
+## Type Declarations
+
+```ts
+/**
+ * Reactively convert a ref to string.
+ *
+ * @see https://vueuse.org/useToString
+ *
+ * @__NO_SIDE_EFFECTS__
+ */
+export declare function useToString(
+  value: MaybeRefOrGetter<unknown>,
+): ComputedRef<string>
+```