Function detectWebGpu

detectWebGpu(): Promise<WebGpuDetection>
The real, asynchronous WebGPU/WGSL check inspectGraphicsCapabilities cannot do synchronously: requests an actual adapter and device, then compiles an actual shader module and reads back its compilation diagnostics. Feed the result to inspectGraphicsCapabilities via probe.webgpu/probe.wgsl once resolved.

Returns Promise<WebGpuDetection>
Example
```
import { detectWebGpu, inspectGraphicsCapabilities } from '@datamoc/mw_games/two-d/render';

const detected = await detectWebGpu();
const capabilities = inspectGraphicsCapabilities({ webgpu: detected.webgpu, wgsl: detected.wgsl });
console.log(capabilities.wgsl); // true only if a real WGSL shader actually compiled
```
- Defined in src/two-d/render/Capabilities.ts:152