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/ConversationManager.d.ts

@@ -0,0 +1,46 @@
+import { EventEmitter } from "events";
+import { type ModelMessage } from "ai";
+import { type HistoryConfig } from "../types";
+export interface ConversationManagerOptions {
+    history?: Partial<HistoryConfig>;
+}
+/**
+ * Manages conversation history (ModelMessage[]) with configurable
+ * limits on message count and total character size.
+ */
+export declare class ConversationManager extends EventEmitter {
+    private conversationHistory;
+    private historyConfig;
+    constructor(options?: ConversationManagerOptions);
+    /**
+     * Add a message to history and trim if needed.
+     */
+    addMessage(message: ModelMessage): void;
+    /**
+     * Get a copy of the current history.
+     */
+    getHistory(): ModelMessage[];
+    /**
+     * Get a direct reference to the history array.
+     * Use with caution — prefer getHistory() for safety.
+     */
+    getHistoryRef(): ModelMessage[];
+    /**
+     * Replace the entire conversation history.
+     */
+    setHistory(history: ModelMessage[]): void;
+    /**
+     * Clear all conversation history.
+     */
+    clearHistory(): void;
+    /**
+     * Get the number of messages in history.
+     */
+    get length(): number;
+    /**
+     * Trim conversation history to stay within configured limits.
+     * Removes oldest messages (always in pairs to preserve user/assistant turns).
+     */
+    private trimHistory;
+}
+//# sourceMappingURL=ConversationManager.d.ts.map