fix: Reset chunk tracking on session reattach (#65)

Author: rpurdel

src/OutgoingConnection.ts

@@ -541,6 +541,16 @@ export class OutgoingConnection {
 		}
 	}
 
+	/**
+	 * Reset chunk tracking state. Call this when the session is reattached to a new WebSocket
+	 * to prevent frames from being discarded as "reordered" when chunk numbers restart from 0.
+	 */
+	resetChunkTracking(): void {
+		logger.info(`Resetting chunk tracking for tag ${this.localTag} (was lastChunkNo=${this.lastChunkNo})`);
+		this.lastChunkNo = -1;
+		this.lastTimestamp = -1;
+	}
+
 	close(): void {
 		this.doClose(false);
 	}

src/transcriberproxy.ts

@@ -269,6 +269,12 @@ export class TranscriberProxy extends EventEmitter {
 		// Re-setup listeners on new WebSocket
 		this.setupWebSocketListeners();
 
+		// Reset chunk tracking on all connections so frames from the new client
+		// aren't discarded as "reordered" (chunk numbers restart from 0)
+		this.outgoingConnections.forEach((connection, tag) => {
+			connection.resetChunkTracking();
+		});
+
 		logger.info(
 			`WebSocket reattached to session ${this.sessionId}, ${this.outgoingConnections.size} active connections preserved`,
 		);