chore: trim VSCode settings and extension list

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

arty.yml

@@ -72,14 +72,6 @@ scripts:
     fc-cache -fv
   vscode:extensions: |
     code --install-extension arcticicestudio.nord-visual-studio-code
-    code --install-extension anthropic.claude-code
     code --install-extension editorconfig.editorconfig
     code --install-extension esbenp.prettier-vscode
-    code --install-extension svelte.svelte-vscode
-    code --install-extension golang.go
-    code --install-extension jock.svg
-    code --install-extension mechatroner.rainbow-csv
-    code --install-extension ms-azuretools.vscode-containers
-    code --install-extension irongeek.vscode-env
-    code --install-extension ms-vscode.powershell
-    code --install-extension google.gemini-cli-vscode-ide-companion
+    code --install-extension ms-azuretools.vscode-containers