Function dynamic_provider_registry_from_dir_with_python_runtime 

pub async fn dynamic_provider_registry_from_dir_with_python_runtime(
    service: SomaService,
    provider_dir: impl Into<PathBuf>,
    python_runtime: PythonProviderRuntime,
) -> Result<ProviderRegistry>

Builds a dynamic registry from a directory with explicit Python execution and immutable environment preparation.