Add ESLint workflow for code quality enforcement

.eslintrc.json

@@ -0,0 +1,21 @@
+{
+  "env": {
+    "browser": true,
+    "es2021": true,
+    "node": true
+  },
+  "extends": [
+    "eslint:recommended"
+  ],
+  "parserOptions": {
+    "ecmaVersion": 12,
+    "sourceType": "module"
+  },
+  "rules": {
+    "no-unused-vars": "error",
+    "no-console": "warn",
+    "semi": ["error", "always"],
+    "quotes": ["error", "single"]
+  },
+  "ignorePatterns": ["node_modules/", "dist/", "build/"]
+}

.github/workflows/lint.yml

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+name: Code Linting
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Setup Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '18'
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Install ESLint globally
+      run: npm install -g eslint
+
+    - name: Run ESLint
+      run: eslint src/ --ext .js

src/example.js

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+// This file demonstrates proper linting compliance
+
+function exampleFunction() {
+    const usedVariable = 'This variable is properly used';
+
+    // Note: console.log is allowed but will show as a warning
+    console.log('This uses single quotes as required');
+
+    let properVariable = 'This line has a semicolon';
+
+    return properVariable;
+}
+
+exampleFunction();