The prebuild script silently did nothing because it invoked the barrel re-export (scripts/generate-news-indexes.ts) instead of the actual executable entry point — so npm run prebuild never generated index files. This caused 3 integration tests to fail with ENOENT after news/index*.html was removed from git tracking.

Changes

• package.json — Fix prebuild to invoke scripts/generate-news-indexes/index.ts (executable) instead of the barrel re-export
• tests/news-realtime-monitor.test.ts — Add beforeAll/afterAll to "Real-world Integration Tests" that generates then cleans up index files at test time; tracks only newly created files to avoid deleting pre-existing ones; logs unexpected cleanup errors rather than silencing all of them
• .github/workflows/news-committee-reports.md — Rename duplicate "Step 5: Validate & Create PR" → "Step 5: Build-time Generation Note"; extend note with local npm run prebuild instruction
• .github/workflows/news-week-ahead.md — Extend build-time generation note to tell agents to run npm run prebuild (or npm run build) on a fresh checkout when they need to preview/validate derived outputs

// beforeAll in "Real-world Integration Tests"
beforeAll(() => {
  const ROOT_DIR = path.join(__dirname, '..');
  const before = new Set(fs.readdirSync(NEWS_DIR).filter(f => f.startsWith('index') && f.endsWith('.html')));
  execSync('npx tsx scripts/generate-news-indexes/index.ts', { cwd: ROOT_DIR, stdio: 'pipe' });
  const after = fs.readdirSync(NEWS_DIR).filter(f => f.startsWith('index') && f.endsWith('.html'));
  GENERATED_INDEX_FILES.push(...after.filter(f => !before.has(f)));
}, 30000);

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