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/useLastChanged.md

@@ -0,0 +1,63 @@
+---
+category: State
+---
+
+# useLastChanged
+
+Records the timestamp of the last change
+
+## Usage
+
+```ts
+import { useLastChanged } from '@vueuse/core'
+import { nextTick } from 'vue'
+
+const a = ref(0)
+const lastChanged = useLastChanged(a)
+
+a.value = 1
+
+await nextTick()
+
+console.log(lastChanged.value) // 1704709379457
+```
+
+By default the change is recorded on the next tick (`watch()` with `flush: 'post'`). If you want to record the change immediately, pass `flush: 'sync'` as the second argument.
+
+```ts
+import { useLastChanged } from '@vueuse/core'
+
+const a = ref(0)
+const lastChanged = useLastChanged(a, { flush: 'sync' })
+
+a.value = 1
+
+console.log(lastChanged.value) // 1704709379457
+```
+
+## Type Declarations
+
+```ts
+export interface UseLastChangedOptions<
+  Immediate extends boolean,
+  InitialValue extends number | null | undefined = undefined,
+> extends WatchOptions<Immediate> {
+  initialValue?: InitialValue
+}
+export type UseLastChangedReturn =
+  | Readonly<ShallowRef<number | null>>
+  | Readonly<ShallowRef<number>>
+/**
+ * Records the timestamp of the last change
+ *
+ * @see https://vueuse.org/useLastChanged
+ */
+export declare function useLastChanged(
+  source: WatchSource,
+  options?: UseLastChangedOptions<false>,
+): Readonly<ShallowRef<number | null>>
+export declare function useLastChanged(
+  source: WatchSource,
+  options: UseLastChangedOptions<true> | UseLastChangedOptions<boolean, number>,
+): Readonly<ShallowRef<number>>
+```