fix(core): update

ts/abstract.classes.multimodal.ts

@@ -0,0 +1,8 @@
+export abstract class MultiModal {
+  abstract start(): Promise<void>;
+  abstract stop(): Promise<void>;
+  
+  // Defines a streaming interface for chat interactions.
+  // The implementation will vary based on the specific AI model.
+  abstract chatStream(input: ReadableStream<string>): ReadableStream<string>;
+}