chore: update arty scripts — trim vscode extensions, add micro editorconfig plugin

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

arty.yml

@@ -70,4 +70,6 @@ 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 editorconfig.editorconfig
+  micro:plugins: |
+    micro -plugin install editorconfig