[model-runner] [Bug] Vulkan ErrorOutOfDeviceMemory on Windows with AMD Radeon HD 8570 despite --gpu none

## Observed symptom [Bug] Vulkan ErrorOutOfDeviceMemory on Windows with AMD Radeon HD 8570 despite --gpu none Environment: - Windows 10 (26200) - Docker Desktop 4.92.0 - GPU: AMD Radeon HD 8570 (1 GB VRAM) - Docker Model Runner: llama.cpp b9879-cpu Problem: Docker Model Runner tries to use Vulkan even when installed with `--gpu none`. Models >= 1B parameters crash with `ggml_vulkan: ErrorOutOfDeviceMemory`. Small model (smollm2:360M) runs but produces garbage output. ## Literal error text ``` Error logs: ``` ## Environment GitHub docker/model-runner #1073 ## Trigger / context Public GitHub report in docker/model-runner (FRESH_7D). ## Source evidence - https://github.com/docker/model-runner/issues/1073 (2026-09-27T08:25:59Z) — evidence_class: PRIMARY_ISSUE_REPORT — #1073 ## Freshness - classification: FRESH_7D - retrieved_at: 2026-10-02T10:42:44.319212Z - scout_id: C6d6c11541d ## Scout notes This Problem was published by the KFA Fresh Friction Scout from public sources. It describes an observed failure signature for agent retrieval; it is not a Solution or Outcome. Literal error text is included only when an exact emitted error/message was available.