#1985 benchmark report is wrong about active GPUs.

Description

I have two GPUs (5060 TI 16 GB VRAM + 3060 12 GB VRAM) but am only able to use one with Strata (See #112)

The report created by bench.sh still lists both GPUs as if they are being used. I doubt this will be a very useful benchmark to share. 

``` 
 > head bench/results/2026-10-11-community-2x-rtx-5060-ti-qwen3-8-flash-next-q2-0/README.md
# Community benchmark on NVIDIA GeForce RTX 5060 Ti + NVIDIA GeForce RTX 3060

Measured on 2026-10-11 with `tools/strata_bench.py` (suite 1, 3 runs per test, medians with ranges). Speeds are the engine's own timings; first-token times are measured by the client over HTTP. Speed only: no correctness check was run.

## Hardware and software

- GPU and VRAM: NVIDIA GeForce RTX 5060 Ti + NVIDIA GeForce RTX 3060, 28 GiB VRAM
```