onnxruntime

2f668789 - Fix WebGPU device destroyed on session release, breaking session recreation (#27634)

Fix WebGPU device destroyed on session release, breaking session recreation (#27634) ## Description We had a weird behavior in Transformers.js V4. After calling `InferenceSession.release()` on a WebGPU session, attempting to create a new WebGPU session fails with: ``` WebGPU device lost (2): Device was destroyed. ``` In Transformers.js we encourage the use of the `create -> release -> create` pattern, because we expect the application to run for some time and might use multiple models. So it makes sense to unload models after the job is done. It seems like this was introduced in [e03631ee528](https://github.com/microsoft/onnxruntime/commit/e03631ee528), which added the `preserveDevice` option with a default value of `false`. When the last session is released and `preserveDevice=false`, the C++ side destroys the WebGPU device, but the JavaScript reference in `env.webgpu.device` is never cleared, leaving a stale reference to a destroyed device. ## Changes **Clear stale device reference when lost** (`backend-webgpu.ts`) 1. Made device property `configurable: true` to allow deletion 2. Added cleanup logic in `dispose()` to detect device loss via `device.lost` promise 3. When device is lost (destroyed, driver crash, etc.), delete the stale `env.webgpu.device` reference This allows subsequent session creation to acquire a fresh device instead of attempting to reuse a lost one.