feat: Introduce new core components for conversation and speech management

- Added ConversationManager for managing conversation history with configurable limits.
- Implemented InputQueue for serial processing of input items.
- Created SpeechManager for handling text-to-speech generation and streaming.
- Developed StreamProcessor for processing LLM streams and forwarding events.
- Added TranscriptionManager for audio transcription using AI SDK.
- Introduced WebSocketManager for managing WebSocket connections and messaging.
- Updated VoiceAgent to support new architecture and improved socket handling.
- Refactored index files to export new core components.

dist/core/WebSocketManager.d.ts

@@ -0,0 +1,35 @@
+import { WebSocket } from "ws";
+import { EventEmitter } from "events";
+/**
+ * Manages a single WebSocket connection lifecycle.
+ * Handles connecting, attaching existing sockets, sending messages,
+ * and clean disconnection.
+ */
+export declare class WebSocketManager extends EventEmitter {
+    private socket?;
+    private _isConnected;
+    get isConnected(): boolean;
+    get currentSocket(): WebSocket | undefined;
+    /**
+     * Connect to a WebSocket server by URL.
+     */
+    connect(url: string): Promise<void>;
+    /**
+     * Attach an existing WebSocket (server-side usage).
+     */
+    handleSocket(socket: WebSocket): void;
+    /**
+     * Send a JSON message via WebSocket if connected.
+     * Gracefully handles send failures (e.g., socket closing mid-send).
+     */
+    send(message: Record<string, unknown>): void;
+    /**
+     * Disconnect and clean up the current socket.
+     */
+    disconnect(): void;
+    /**
+     * Attach internal event listeners on the current socket.
+     */
+    private attachListeners;
+}
+//# sourceMappingURL=WebSocketManager.d.ts.map