chore(sdk): update removeTunnel() oo sdk method and add smoketest

src/sdk/devbox.ts

@@ -130,19 +130,14 @@ export class DevboxNetOps {
   }
 
   /**
-   * @deprecated Only works with legacy tunnels created via {@link createTunnel}.
-   * V2 tunnels (from {@link enableTunnel}) remain active until devbox shutdown and cannot be removed.
-   *
-   * Remove a legacy tunnel from the devbox.
+   * Remove an existing V2 tunnel from the devbox.
    *
    * @example
    * ```typescript
-   * // Deprecated - only for legacy tunnels
    * await devbox.net.removeTunnel();
    * ```
    *
    * @param {Core.RequestOptions} [options] - Request options
-   * @returns {Promise<DevboxRemoveTunnelResponse>} Tunnel removal result
    */
   async removeTunnel(options?: Core.RequestOptions) {
     return this.client.devboxes.removeTunnel(this.devboxId, options);

tests/smoketests/object-oriented/devbox.test.ts

@@ -282,6 +282,11 @@ describe('smoketest: object-oriented devbox', () => {
         const info = await devbox.getInfo();
         expect(info.tunnel).toBeDefined();
         expect(info.tunnel?.tunnel_key).toBe(tunnel.tunnel_key);
+
+        await devbox.net.removeTunnel();
+
+        const tunnelAfterRemoval = await devbox.getTunnel();
+        expect(tunnelAfterRemoval).toBeNull();
       } finally {
         await devbox.shutdown();
       }