docs(spaces-dev-mode): surface SSH command, lead with SSH over VS Code (#2488)

* docs(spaces-dev-mode): surface SSH command, lead with SSH over VS Code

SSH is the underlying connection mechanism — VS Code rides on top of it — but the page currently mentions VS Code first and tells readers to find the SSH instructions in the UI modal. Reframe the intro accordingly and show the actual `ssh <subdomain>@ssh.hf.space` command plus a snippet to fetch the subdomain via `HfApi.space_info()`, so anyone reading the docs (humans or agents) can connect without going through the UI.

* docs(spaces-dev-mode): drop Beta-stage warning

* docs(spaces-dev-mode): clarify SSH vs VS Code web servers

Author: gary149

docs/hub/spaces-dev-mode.md

@@ -1,8 +1,5 @@
 # Spaces Dev Mode: Seamless development in Spaces
 
-> [!WARNING]
-> This feature is still in Beta stage.
-
 > [!WARNING]
 > The Spaces Dev Mode is part of <a href="https://huggingface.co/pro">PRO</a> or <a href="https://huggingface.co/enterprise">Team & Enterprise</a> plans.
 
@@ -14,7 +11,7 @@ Whenever your commit some changes to your Space repo, the underlying Docker imag
 
 The Dev Mode allows you to update your Space much quicker by overriding the Docker image.
 
-The Dev Mode Docker image starts your application as a sub-process, allowing you to restart it without stopping the Space container itself. It also starts a VS Code server and a SSH server in the background for you to connect to the Space.
+The Dev Mode Docker image starts your application as a sub-process, allowing you to restart it without stopping the Space container itself. It also starts an SSH server (for local editors and terminals) and a VS Code server (for the in-product VS Code Web) in the background, so you can connect to the Space.
 
 The ability to connect to the running Space unlocks several use cases:
 
@@ -39,16 +36,31 @@ The application does not restart automatically when you change the code. For you
   You will need to manually run `pip install` from VS Code or SSH.
 </div>
 
-### SSH connection and VS Code
+### Connecting
+
+Dev Mode exposes the running Space as a standard SSH host. VS Code and any other editor connect through that same SSH endpoint.
+
+#### SSH
+
+Once Dev Mode is running, connect with:
 
-The Dev Mode allows you to connect to your Space's docker container using SSH.
+```shell
+ssh <space-subdomain>@ssh.hf.space
+```
 
-Instructions to connect are listed in the Dev Mode controls modal.
+The subdomain is shown in the Dev Mode controls modal. You can also retrieve it programmatically:
+
+```python
+from huggingface_hub import HfApi
+print(HfApi().space_info("namespace/repo").subdomain)
+```
 
 You will need to add your machine's SSH public key to [your user account](https://huggingface.co/settings/keys) to be able to connect to the Space using SSH.
 Check out the [Git over SSH](./security-git-ssh#add-a-ssh-key-to-your-account) documentation for more detailed instructions.
 
-You can also use a local install of VS Code to connect to the Space container. To do so, you will need to install the [SSH Remote](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-ssh) extension.
+#### VS Code
+
+You can also use a local install of VS Code to connect to the Space container. To do so, install the [Remote - SSH](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-ssh) extension and connect to the same `<space-subdomain>@ssh.hf.space` host.
 
 ### Persisting changes