fix: 코드 리뷰 지적사항 일괄 수정 (Critical 5건 · High 3건 · Medium 다수)

.github/workflows/ci.yml

@@ -30,6 +30,9 @@ jobs:
       - name: Run unit tests
         run: npm test
 
+      - name: Lint
+        run: npm run lint
+
       - name: Type-check
         run: npm run typecheck
 

README.md

@@ -16,7 +16,7 @@ Repository / 리포지토리: <https://github.com/microsoft/CopilotWatchTower>
 
 ### Quick start (Electron)
 
-Requirements: Node.js 20+ (bundles Electron 42 / Node 24), Windows.
+Requirements: Node.js 22+ (`node:sqlite` is required at build/test time; bundles Electron 42 / Node 24), Windows.
 
 ```powershell
 # Install dependencies (first time only)
@@ -113,7 +113,7 @@ copilot-watchtower
 
 ### 빠른 시작 (Electron)
 
-요구사항: Node.js 20+ (Electron 42 / Node 24 번들), Windows.
+요구사항: Node.js 22+ (빌드/테스트에 `node:sqlite` 필요, Electron 42 / Node 24 번들), Windows.
 
 ```powershell
 # 의존성 설치 (최초 1회)

eslint.config.mjs

@@ -0,0 +1,43 @@
+import js from '@eslint/js'
+import tseslint from 'typescript-eslint'
+import reactHooks from 'eslint-plugin-react-hooks'
+import globals from 'globals'
+
+export default tseslint.config(
+  { ignores: ['out/**', 'dist/**', 'node_modules/**', 'legacy/**', '*.config.js'] },
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    files: ['**/*.{ts,tsx}'],
+    languageOptions: {
+      parserOptions: { ecmaVersion: 'latest', sourceType: 'module' }
+    },
+    rules: {
+      // Unused values are usually a leftover from an incomplete refactor — the
+      // dead ko-KR number formatters this config was added to catch, for example.
+      '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_', varsIgnorePattern: '^_' }],
+      '@typescript-eslint/no-explicit-any': 'error',
+      'no-console': ['warn', { allow: ['error'] }],
+      eqeqeq: ['error', 'smart']
+    }
+  },
+  {
+    files: ['src/main/**/*.ts', 'src/preload/**/*.ts'],
+    languageOptions: { globals: { ...globals.node } }
+  },
+  {
+    files: ['src/renderer/**/*.{ts,tsx}'],
+    languageOptions: { globals: { ...globals.browser } },
+    plugins: { 'react-hooks': reactHooks },
+    rules: {
+      ...reactHooks.configs.recommended.rules,
+      // Stale-closure and missing-dependency bugs are the single most common
+      // class of defect in this renderer; treat them as errors, not hints.
+      'react-hooks/exhaustive-deps': 'error'
+    }
+  },
+  {
+    files: ['tests/**/*.ts', '**/*.test.ts'],
+    languageOptions: { globals: { ...globals.node } }
+  }
+)