Llm4sGeminiModule

Registers llm4s-gemini's providers: the Google Gemini API (id gemini, alias google) and Google Cloud Vertex AI (id vertexai, alias vertex).

Vertex AI ships here rather than in a module of its own because it only calls Google's publishers/google (Gemini) models, in the same JSON format as the Gemini API. It differs in endpoint and authentication, not in model family, and adds no dependency.

Declared in this module's META-INF/services/org.llm4s.llmconnect.spi.Llm4sProviderModule, so adding the llm4s-gemini dependency is all it takes for ProviderRegistry.default to resolve provider = "gemini" and provider = "vertexai". Where discovery cannot run - a fat jar whose services files were overwritten rather than merged - register it explicitly:

given ProviderRegistry = ProviderRegistry.builtin.withModule(new Llm4sGeminiModule)

A class rather than an object because java.util.ServiceLoader instantiates the class named in the services file through its public no-arg constructor.