Add code quality gates

Add ESLint/quality gates, per-file ratchet budgets, and regression tests for code quality checks.

eslint.config.js

@@ -0,0 +1,71 @@
+import js from '@eslint/js';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  {
+    ignores: [
+      'dist/**',
+      'node_modules/**',
+      'apps/dashboard/dist/**',
+      'runners/*/dist/**',
+      'runners/*/node_modules/**',
+      'store/**',
+      'store-*/**',
+      'data/**',
+      'data-*/**',
+      'coverage/**',
+      'tmp/**',
+      'cache/**',
+    ],
+  },
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    files: ['**/*.{ts,tsx,js,jsx}'],
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+        ...globals.es2022,
+        Bun: 'readonly',
+      },
+    },
+    rules: {
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-unused-vars': [
+        'warn',
+        {
+          argsIgnorePattern: '^_',
+          caughtErrorsIgnorePattern: '^_',
+          varsIgnorePattern: '^_',
+        },
+      ],
+      '@typescript-eslint/no-empty-object-type': 'warn',
+      complexity: ['warn', { max: 35 }],
+      'max-depth': ['warn', 5],
+      'max-lines-per-function': [
+        'warn',
+        {
+          max: 180,
+          skipBlankLines: true,
+          skipComments: true,
+        },
+      ],
+      'max-params': ['warn', 7],
+      'no-case-declarations': 'warn',
+      'no-console': 'off',
+      'no-control-regex': 'off',
+      'no-unsafe-finally': 'warn',
+      'no-useless-assignment': 'warn',
+      'no-useless-escape': 'warn',
+      'preserve-caught-error': 'warn',
+    },
+  },
+  {
+    files: ['**/*.test.ts', '**/*.test.tsx', 'scripts/**/*.ts'],
+    rules: {
+      'max-lines-per-function': 'off',
+    },
+  },
+);