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/watchExtractedObservable.md

@@ -0,0 +1,167 @@
+---
+category: '@RxJS'
+---
+
+# watchExtractedObservable
+
+Watch the values of an RxJS [`Observable`](https://rxjs.dev/guide/observable) as extracted from one or more composables.
+
+Automatically unsubscribe on observable change, and automatically unsubscribe from it when the component is unmounted.
+
+Supports all overloads of [`watch`](https://vuejs.org/guide/essentials/watchers.html#basic-example).
+
+## Usage
+
+<!-- TODO: import rxjs error if enable twoslash -->
+
+```ts no-twoslash
+import { watchExtractedObservable } from '@vueuse/rxjs'
+import { computed, reactive, useTemplateRef } from 'vue'
+import { AudioPlayer } from '../my/libs/AudioPlayer'
+
+// setup()
+
+const audio = useTemplateRef('audio')
+const player = computed(() => (audio.value ? new AudioPlayer(audio.value) : null))
+const state = reactive({
+  progress: 0,
+})
+
+watchExtractedObservable(player, p => p.progress$, (percentage) => {
+  state.progress = percentage * 100
+})
+```
+
+If you want to add custom error handling to an `Observable` that might error, you can supply an optional `onError` configuration. Without this, RxJS will treat any error in the supplied `Observable` as an "unhandled error" and it will be thrown in a new call stack and reported to `window.onerror` (or `process.on('error')` if you happen to be in Node).
+
+You can also supply an optional `onComplete` configuration if you need to attach special behavior when the watched observable completes.
+
+```ts no-twoslash
+import { watchExtractedObservable } from '@vueuse/rxjs'
+import { computed, reactive, useTemplateRef } from 'vue'
+import { AudioPlayer } from '../my/libs/AudioPlayer'
+
+// setup()
+
+const audio = useTemplateRef('audio')
+const player = computed(() => (audio.value ? new AudioPlayer(audio.value) : null))
+const state = reactive({
+  progress: 0,
+})
+
+watchExtractedObservable(player, p => p.progress$, (percentage) => {
+  state.progress = percentage * 100
+}, {
+  onError: (err: unknown) => {
+    console.error(err)
+  },
+  onComplete: () => {
+    state.progress = 100 // or 0, or whatever
+  },
+})
+```
+
+If you want, you can also pass `watch` options as the last argument:
+
+```ts no-twoslash
+import { watchExtractedObservable } from '@vueuse/rxjs'
+import { computed, reactive, useTemplateRef } from 'vue'
+import { AudioPlayer } from '../my/libs/AudioPlayer'
+
+// setup()
+
+const audio = useTemplateRef('audio')
+const player = computed(() => (audio.value ? new AudioPlayer(audio.value) : null))
+const state = reactive({
+  progress: 0,
+})
+
+watchExtractedObservable(player, p => p.progress$, (percentage) => {
+  state.progress = percentage * 100
+}, {
+  onError: (err: unknown) => {
+    console.error(err)
+  }
+}, {
+  immediate: true
+})
+```
+
+## Type Declarations
+
+```ts
+export type OnCleanup = (cleanupFn: () => void) => void
+export type WatchExtractedObservableCallback<
+  Value,
+  OldValue,
+  ObservableElement,
+> = (
+  value: NonNullable<Value>,
+  oldValue: OldValue,
+  onCleanup: OnCleanup,
+) => Observable<ObservableElement>
+export interface WatchExtractedObservableOptions {
+  onError?: (err: unknown) => void
+  onComplete?: () => void
+}
+export declare function watchExtractedObservable<
+  T extends MultiWatchSources,
+  E,
+  Immediate extends Readonly<boolean> = false,
+>(
+  sources: [...T],
+  extractor: WatchExtractedObservableCallback<
+    MapSources<T>,
+    MapOldSources<T, Immediate>,
+    E
+  >,
+  callback: (snapshot: E) => void,
+  subscriptionOptions?: WatchExtractedObservableOptions,
+  watchOptions?: WatchOptions<Immediate>,
+): WatchHandle
+export declare function watchExtractedObservable<
+  T extends Readonly<MultiWatchSources>,
+  E,
+  Immediate extends Readonly<boolean> = false,
+>(
+  source: T,
+  extractor: WatchExtractedObservableCallback<
+    MapSources<T>,
+    MapOldSources<T, Immediate>,
+    E
+  >,
+  callback: (snapshot: E) => void,
+  subscriptionOptions?: WatchExtractedObservableOptions,
+  watchOptions?: WatchOptions<Immediate>,
+): WatchHandle
+export declare function watchExtractedObservable<
+  T,
+  E,
+  Immediate extends Readonly<boolean> = false,
+>(
+  source: WatchSource<T>,
+  extractor: WatchExtractedObservableCallback<
+    T,
+    Immediate extends true ? T | undefined : T,
+    E
+  >,
+  callback: (snapshot: E) => void,
+  subscriptionOptions?: WatchExtractedObservableOptions,
+  watchOptions?: WatchOptions<Immediate>,
+): WatchHandle
+export declare function watchExtractedObservable<
+  T extends object,
+  E,
+  Immediate extends Readonly<boolean> = false,
+>(
+  source: T,
+  extractor: WatchExtractedObservableCallback<
+    T,
+    Immediate extends true ? T | undefined : T,
+    E
+  >,
+  callback: (snapshot: E) => void,
+  subscriptionOptions?: WatchExtractedObservableOptions,
+  watchOptions?: WatchOptions<Immediate>,
+): WatchHandle
+```