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/useProjection.md

@@ -0,0 +1,38 @@
+---
+category: '@Math'
+related: createGenericProjection
+---
+
+# useProjection
+
+Reactive numeric projection from one domain to another.
+
+## Usage
+
+```ts
+import { useProjection } from '@vueuse/math'
+
+const input = ref(0)
+const projected = useProjection(input, [0, 10], [0, 100])
+
+input.value = 5 // projected.value === 50
+input.value = 10 // projected.value === 100
+```
+
+## Type Declarations
+
+```ts
+/**
+ * Reactive numeric projection from one domain to another.
+ *
+ * @see https://vueuse.org/useProjection
+ *
+ * @__NO_SIDE_EFFECTS__
+ */
+export declare function useProjection(
+  input: MaybeRefOrGetter<number>,
+  fromDomain: MaybeRefOrGetter<readonly [number, number]>,
+  toDomain: MaybeRefOrGetter<readonly [number, number]>,
+  projector?: ProjectorFunction<number, number>,
+): ComputedRef<number>
+```