Place the full Dexi/Ollama-compatible engine binary here.

Accepted names:
- dexi-engine.exe   preferred
- ollama.exe        fallback

The portable supervisor at ..\dexi-runtime.exe will find it, set portable folders, and start it with:
- OLLAMA_HOST=http://127.0.0.1:11434
- OLLAMA_MODELS=runtime\models
- OLLAMA_NO_CLOUD=1
