feat(F-001): scaffold modular monolith skeleton with boundary checker

- TypeScript + Fastify skeleton under project/ (src/modules, shared, infrastructure, app)
- scripts/check-module-boundaries.mjs enforcing module public-API rules (tested with fixtures)
- GET /health endpoint, error envelope without stack leakage
- specs/F-001-scaffold (SPEC/DESIGN/TASKS/TESTS), spec/tech.md dependency justification
- 30-ticket MercadoDeVida roadmap in backlog/features.json, spec/roadmap.md
- All gates approved: reviewer, security, qa; verify.sh green

project/eslint.config.mjs

@@ -0,0 +1,34 @@
+// @ts-check
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import prettier from 'eslint-config-prettier';
+
+export default tseslint.config(
+  {
+    ignores: ['dist/**', 'node_modules/**', 'coverage/**', 'scripts/tests/fixtures/**'],
+  },
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  prettier,
+  {
+    rules: {
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        { argsIgnorePattern: '^_', varsIgnorePattern: '^_' },
+      ],
+      'no-console': ['error', { allow: ['error'] }],
+    },
+  },
+  {
+    files: ['**/*.mjs'],
+    languageOptions: {
+      globals: {
+        console: 'readonly',
+        process: 'readonly',
+      },
+    },
+    rules: {
+      'no-console': ['error', { allow: ['error', 'log'] }],
+    },
+  },
+);