fix: lint: Ban waitForTimeout, setTimeout-as-delay, and fixed sleep patterns (#442)

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

eslint.config.js

@@ -0,0 +1,58 @@
+import tseslint from '@typescript-eslint/eslint-plugin';
+import tsparser from '@typescript-eslint/parser';
+
+export default [
+  {
+    name: 'tests/files-to-lint',
+    files: ['tests/**/*.ts', 'scripts/harb-evaluator/**/*.ts'],
+    languageOptions: {
+      parser: tsparser,
+      parserOptions: {
+        ecmaVersion: 2022,
+        sourceType: 'module',
+      },
+      globals: {
+        process: 'readonly',
+        console: 'readonly',
+        fetch: 'readonly',
+        setTimeout: 'readonly',
+        Date: 'readonly',
+        Promise: 'readonly',
+      },
+    },
+    plugins: {
+      '@typescript-eslint': tseslint,
+    },
+    rules: {
+      '@typescript-eslint/no-explicit-any': 'error',
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        {
+          argsIgnorePattern: '^_',
+          varsIgnorePattern: '^_',
+          caughtErrorsIgnorePattern: '^_',
+        },
+      ],
+    },
+  },
+  {
+    name: 'arch/no-fixed-delays',
+    files: ['tests/**/*.ts', 'scripts/harb-evaluator/**/*.ts'],
+    rules: {
+      'no-restricted-syntax': [
+        'error',
+        {
+          selector: "CallExpression[callee.property.name='waitForTimeout']",
+          message:
+            '[BANNED] waitForTimeout is a fixed delay. → Subscribe to events instead (eth_newFilter for on-chain, waitForSelector/waitForURL for DOM). → Polling with timeout is acceptable only if no event source exists. → See AGENTS.md #Engineering Principles.',
+        },
+        {
+          selector:
+            "NewExpression[callee.name='Promise'] > ArrowFunctionExpression CallExpression[callee.name='setTimeout']",
+          message:
+            '[BANNED] Promise+setTimeout sleep pattern. → Use event subscription or polling with timeout instead. → See AGENTS.md #Engineering Principles.',
+        },
+      ],
+    },
+  },
+];