Function createGeminiAdapter

Adapters exports - Model adapters (Claude, OpenAI, Gemini, Ollama) Split from index.ts for file size compliance (Issue #285)

createGeminiAdapter(config: GeminiAdapterConfig): GeminiAdapter
Creates a GeminiAdapter with the specified configuration. Factory function for cleaner API.
Parameters
- config: GeminiAdapterConfig
  Gemini adapter configuration
Returns GeminiAdapter
A configured GeminiAdapter instance
Example
```
const adapter = createGeminiAdapter({
  modelId: 'gemini-2.5-flash',
  apiKey: process.env.GOOGLE_AI_API_KEY!,
});
```
- Defined in packages/nexus-agents/src/adapters/gemini-adapter.ts:424