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/InputQueue.js

@@ -0,0 +1,61 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.InputQueue = void 0;
+class InputQueue {
+    queue = [];
+    processing = false;
+    /** Callback invoked for each item — must return a resolved value */
+    processor = async () => "";
+    /**
+     * Enqueue an item for serial processing.
+     */
+    enqueue(item) {
+        this.queue.push(item);
+        this.drain();
+    }
+    /**
+     * Reject all pending items (used on disconnect/destroy).
+     */
+    rejectAll(reason) {
+        for (const item of this.queue) {
+            item.reject(reason);
+        }
+        this.queue = [];
+        this.processing = false;
+    }
+    /**
+     * Number of items waiting in the queue.
+     */
+    get length() {
+        return this.queue.length;
+    }
+    /**
+     * Whether the queue is currently processing an item.
+     */
+    get isProcessing() {
+        return this.processing;
+    }
+    // ── Private ──────────────────────────────────────────
+    async drain() {
+        if (this.processing)
+            return;
+        this.processing = true;
+        try {
+            while (this.queue.length > 0) {
+                const item = this.queue.shift();
+                try {
+                    const result = await this.processor(item);
+                    item.resolve(result);
+                }
+                catch (error) {
+                    item.reject(error);
+                }
+            }
+        }
+        finally {
+            this.processing = false;
+        }
+    }
+}
+exports.InputQueue = InputQueue;
+//# sourceMappingURL=InputQueue.js.map