test: add stress test scripts for large file handling

- stress-test.js: Tests ValueExtractor performance with 10K/50K/100K/500K/1M lines
- generate-test-file.js: Generates test log files for browser testing
- Add npm run test:stress script
- Update CI to run stress tests on every PR

Test results:
- 10K lines: 13ms parse time, 14MB memory
- 50K lines: 50ms parse time, 30MB memory
- 100K lines: 110ms parse time, 66MB memory
- 500K lines: 378ms parse time, 284MB memory
- 1M lines: 681ms parse time, 606MB memory

Author: claude

.github/workflows/ci.yml

@@ -3,7 +3,7 @@ name: CI
 on:
   pull_request:
   push:
-    branches: [ main ]
+    branches: [ main, master ]
 
 jobs:
   test:
@@ -15,6 +15,21 @@ jobs:
           node-version: '20'
           cache: 'npm'
       - run: npm install
+      - run: npm run lint
       - run: npm test
         env:
           CI: true
+
+  stress-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+      - run: npm install
+      - name: Run stress test (10K - 1M lines)
+        run: npm run test:stress
+        env:
+          NODE_OPTIONS: '--max-old-space-size=4096'

package.json

@@ -10,7 +10,8 @@
     "build": "vite build",
     "lint": "eslint .",
     "preview": "vite preview",
-    "test": "vitest run --coverage"
+    "test": "vitest run --coverage",
+    "test:stress": "node scripts/stress-test.js"
   },
   "dependencies": {
     "@tailwindcss/forms": "^0.5.10",

scripts/stress-test.js

@@ -93,6 +93,8 @@ async function runStressTest() {
     { lines: 10000, name: '10K lines' },
     { lines: 50000, name: '50K lines' },
     { lines: 100000, name: '100K lines' },
+    { lines: 500000, name: '500K lines' },
+    { lines: 1000000, name: '1M lines' },
   ];
 
   testMemoryUsage('Initial');
@@ -143,4 +145,11 @@ async function runStressTest() {
 }
 
 // Run the test
-runStressTest().catch(console.error);
+runStressTest()
+  .then(() => {
+    process.exit(0);
+  })
+  .catch((error) => {
+    console.error('❌ Stress test failed:', error);
+    process.exit(1);
+  });