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/useFavicon.md

@@ -0,0 +1,67 @@
+---
+category: Browser
+---
+
+# useFavicon
+
+Reactive favicon
+
+## Usage
+
+```ts {3}
+import { useFavicon } from '@vueuse/core'
+
+const icon = useFavicon()
+
+icon.value = 'dark.png' // change current icon
+```
+
+### Passing a source ref
+
+You can pass a `ref` to it, changes from of the source ref will be reflected to your favicon automatically.
+
+```ts {7}
+import { useFavicon, usePreferredDark } from '@vueuse/core'
+import { computed } from 'vue'
+
+const isDark = usePreferredDark()
+const favicon = computed(() => isDark.value ? 'dark.png' : 'light.png')
+
+useFavicon(favicon)
+```
+
+When a source ref is passed, the return ref will be identical to the source ref
+
+```ts
+import { useFavicon } from '@vueuse/core'
+// ---cut---
+const source = shallowRef('icon.png')
+const icon = useFavicon(source)
+
+console.log(icon === source) // true
+```
+
+## Type Declarations
+
+```ts
+export interface UseFaviconOptions extends ConfigurableDocument {
+  baseUrl?: string
+  rel?: string
+}
+/**
+ * Reactive favicon.
+ *
+ * @see https://vueuse.org/useFavicon
+ * @param newIcon
+ * @param options
+ */
+export declare function useFavicon(
+  newIcon: ReadonlyRefOrGetter<string | null | undefined>,
+  options?: UseFaviconOptions,
+): ComputedRef<string | null | undefined>
+export declare function useFavicon(
+  newIcon?: MaybeRef<string | null | undefined>,
+  options?: UseFaviconOptions,
+): Ref<string | null | undefined>
+export type UseFaviconReturn = ReturnType<typeof useFavicon>
+```