Function setupDevtools

setupDevtools(bus: Observable, app: unknown): () => void
Connect a command bus to Vue DevTools.
- Adds a Commands timeline layer: every dispatch appears as an event, green for success, red for error.
- Adds a Vapor Chamber inspector panel: browse recent commands, inspect target/payload/result of each one.
Parameters
- bus: Observable
  A CommandBus or AsyncCommandBus instance to observe.
- app: unknown
  The Vue app instance (passed to setupDevtoolsPlugin).
Returns () => void
Unsubscribe function — call it to detach from the bus.
Example
```
import { createApp } from 'vue';
import { getCommandBus, setupDevtools } from 'vapor-chamber';

const app = createApp(App);
setupDevtools(getCommandBus(), app);
app.mount('#app');
```
- Defined in devtools.ts:46