feat: 階段五六 - findings commit/push 到來源分支，critical 問題 exit 1

app/main.js

@@ -3,6 +3,7 @@ import { loadRoles, getRoleIntro } from './roles.js';
 import { getPRDiff, postComment } from './gitea.js';
 import { analyzeWithRole, loadOldFindings, mergeFindings, sortByLevel, deduplicateWithAI } from './findings.js';
 import { saveFindings, postOldFindingsComment, postNewNonCriticalComment, postNewCriticalComments } from './comments.js';
+import { commitAndPush } from './git.js';
 
 const WORKSPACE = process.env.GITHUB_WORKSPACE || '/workspace';
 
@@ -88,11 +89,19 @@ async function main() {
     console.log(`  ⚠️  comment 發布失敗（繼續執行）: ${e.message}`);
   }
 
-  console.log('\n💾 Step5: 記憶區 Commit/Push（待實作）');
-  console.log('  [stub] commit & push findings.json...');
+  // Step5: commit/push findings.json 到來源分支
+  console.log('\n💾 Step5: 記憶區 Commit/Push');
+  commitAndPush(WORKSPACE);
 
-  console.log('\n🚦 Step6: 嚴重問題檢查（待實作）');
-  console.log('  [stub] 檢查 critical findings...');
+  // Step6: 有 critical 問題則 exit 1
+  console.log('\n🚦 Step6: 嚴重問題檢查');
+  const criticalCount = sorted.filter(f => f.level === 'critical').length;
+  if (criticalCount > 0) {
+    console.log(`  ❌ 發現 ${criticalCount} 個嚴重問題，workflow 結束（exit 1）`);
+    console.log('='.repeat(60));
+    process.exit(1);
+  }
+  console.log('  ✅ 無嚴重問題');
 
   console.log('\n✅ Pipeline 完成');
   console.log('='.repeat(60));