RuboCop Stage I: Update and improve production gem

.github/workflows/rubocop.yml

@@ -0,0 +1,31 @@
+name: RuboCop
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ['3.3']
+
+    continue-on-error: ${{ matrix.channel != 'stable' }}
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: '3.3'
+        bundler-cache: true
+    - name: Test with Rake
+      run: |
+        bundle exec rubocop

.rubocop.yml

@@ -1 +1,13 @@
 inherit_from: .rubocop_todo.yml
+
+require:
+  - rubocop-packaging
+  - rubocop-performance
+  - rubocop-rake
+  - rubocop-rspec
+
+AllCops:
+  TargetRubyVersion: 3.1
+  NewCops: enable
+  DisplayStyleGuide: true
+  ExtraDetails: true