Add benchmark results for AMD Radeon (RYZEN AI MAX+ 395) (#5)

## New Benchmark Data

Adds 16 benchmark result files from AMD hardware.

### Models Tested
- gpt-oss-120b-MXFP4 (llama.cpp via Vulkan)
- gpt-oss-20b-MXFP4 (llama.cpp via Vulkan)
- gpt-oss-20b (Ollama)
- nemotron-3-nano (Ollama)

### Hardware
- **CPU**: AMD RYZEN AI MAX+ 395 w/ Radeon 8060S
- **GPU**: AMD Radeon Graphics (integrated)
- **RAM**: 125.1 GB
- **OS**: Linux 6.14.0-37-generic

### Test Sets
Each model was tested on all 4 test sets: easy, medium, hard, mixed.

Author: NOVADEDOG