feat(providers): Add research API and image generation/editing support; extend providers and tests

ts/provider.xai.ts

@@ -1,7 +1,16 @@
 import * as plugins from './plugins.js';
 import * as paths from './paths.js';
 import { MultiModalModel } from './abstract.classes.multimodal.js';
-import type { ChatOptions, ChatResponse, ChatMessage, ResearchOptions, ResearchResponse } from './abstract.classes.multimodal.js';
+import type {
+  ChatOptions,
+  ChatResponse,
+  ChatMessage,
+  ResearchOptions,
+  ResearchResponse,
+  ImageGenerateOptions,
+  ImageEditOptions,
+  ImageResponse
+} from './abstract.classes.multimodal.js';
 import type { ChatCompletionMessageParam } from 'openai/resources/chat/completions';
 
 export interface IXAIProviderOptions {
@@ -185,4 +194,18 @@ export class XAIProvider extends MultiModalModel {
   public async research(optionsArg: ResearchOptions): Promise<ResearchResponse> {
     throw new Error('Research capabilities are not yet supported by xAI provider.');
   }
+
+  /**
+   * Image generation is not supported by xAI
+   */
+  public async imageGenerate(optionsArg: ImageGenerateOptions): Promise<ImageResponse> {
+    throw new Error('Image generation is not supported by xAI. Please use OpenAI provider for image generation.');
+  }
+
+  /**
+   * Image editing is not supported by xAI
+   */
+  public async imageEdit(optionsArg: ImageEditOptions): Promise<ImageResponse> {
+    throw new Error('Image editing is not supported by xAI. Please use OpenAI provider for image editing.');
+  }
 }