chore: update VSCode workspace settings and arty scripts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

arty.yml

@@ -70,6 +70,4 @@ scripts:
     unzip -o /tmp/Meslo.zip "MesloLGLDZ*.ttf" -d ~/.local/share/fonts/MesloNerdFont
     fc-cache -fv
   vscode:extensions: |
-    code --install-extension editorconfig.editorconfig
-    code --install-extension esbenp.prettier-vscode
-    code --install-extension ms-azuretools.vscode-containers
+    code --install-extension editorconfig.editorconfig