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/useCssVar.md

@@ -0,0 +1,50 @@
+---
+category: Browser
+---
+
+# useCssVar
+
+Manipulate CSS variables
+
+## Usage
+
+```ts
+import { useCssVar } from '@vueuse/core'
+import { useTemplateRef } from 'vue'
+
+const el = useTemplateRef('el')
+const color1 = useCssVar('--color', el)
+
+const elv = useTemplateRef('elv')
+const key = ref('--color')
+const colorVal = useCssVar(key, elv)
+
+const someEl = useTemplateRef('someEl')
+const color2 = useCssVar('--color', someEl, { initialValue: '#eee' })
+```
+
+## Type Declarations
+
+```ts
+export interface UseCssVarOptions extends ConfigurableWindow {
+  initialValue?: string
+  /**
+   * Use MutationObserver to monitor variable changes
+   * @default false
+   */
+  observe?: boolean
+}
+/**
+ * Manipulate CSS variables.
+ *
+ * @see https://vueuse.org/useCssVar
+ * @param prop
+ * @param target
+ * @param options
+ */
+export declare function useCssVar(
+  prop: MaybeRefOrGetter<string | null | undefined>,
+  target?: MaybeElementRef,
+  options?: UseCssVarOptions,
+): ShallowRef<string | undefined, string | undefined>
+```