fix(coding-agent): split /clone from /fork UX

closes #2962

packages/coding-agent/src/modes/rpc/rpc-client.ts

@@ -342,6 +342,15 @@ export class RpcClient {
 		return this.getData(response);
 	}
 
+	/**
+	 * Clone the current active branch into a new session.
+	 * @returns Object with `cancelled: true` if an extension cancelled the clone
+	 */
+	async clone(): Promise<{ cancelled: boolean }> {
+		const response = await this.send({ type: "clone" });
+		return this.getData(response);
+	}
+
 	/**
 	 * Get messages available for forking.
 	 */