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+import fs from 'node:fs';
+import path from 'node:path';
+
+const root = process.cwd();
+const read = relative => fs.readFileSync(path.join(root, relative), 'utf8');
+const js = read('public/media-library-ux.js');
+const css = read('public/media-library-ux.css');
+const loader = read('public/ux-foundation.js');
+const html = read('public/index.html');
+const pkg = JSON.parse(read('package.json'));
+
+const failures = [];
+const expect = (condition, message) => {
+  if (!condition) failures.push(message);
+};
+const includesAll = (source, values, label) => {
+  for (const value of values) expect(source.includes(value), `${label}: ${value}`);
+};
+
+includesAll(html, [
+  'id="media-library"',
+  'id="media-grid"',
+  'id="media-search"',
+  'id="media-source"',
+  'id="media-sort"',
+  'id="media-favorites-only"',
+  'id="media-selected-count"',
+  'id="media-lightbox"',
+  'id="media-lightbox-stage"',
+], 'Bestehender Medienvertrag fehlt');
+
+includesAll(loader, [
+  'media-library-ux.css?v=1.44.0',
+  'media-library-ux.js?v=1.44.0',
+  'data-ux-media-library',
+  'loadMediaLibraryAssets()',
+], 'UX-Loader bindet Medienbibliothek nicht vollständig ein');
+
+expect(pkg.scripts?.['verify:media-library'] === 'node tools/verify-media-library-ux-1.44.0.mjs', 'verify:media-library Script fehlt');
+expect(pkg.scripts?.['verify:all']?.includes('npm run verify:media-library'), 'verify:all enthält das Medienbibliothek-Gate nicht');
+
+includesAll(js, [
+  'DENSITY_KEY',
+  'data-media-density-option',
+  'ux-media-filter-details',
+  'ux-media-active-filters',
+  'ux-media-filter-chip',
+  'data-has-media-selection',
+  'ux-media-batch-more',
+  'MutationObserver',
+  'data-media-preview',
+  'data-media-use',
+  'data-ux-media-preview-nav',
+  "event.key === 'ArrowLeft'",
+  "event.key === 'ArrowRight'",
+  'requestAnimationFrame',
+], 'Medienbibliothek-UX-Vertrag fehlt');
+
+includesAll(css, [
+  '#media-library[data-media-density="compact"]',
+  '#media-library[data-media-density="large"]',
+  '.ux-media-command',
+  '.ux-media-filter-panel',
+  '.ux-media-active-filters',
+  '#media-library[data-has-media-selection] .media-batchbar',
+  '.ux-media-batch-more',
+  '#media-library .media-grid',
+  '#media-library .media-card-actions',
+  '.ux-media-lightbox-nav',
+  '@media (max-width: 760px)',
+  '@media (max-width: 470px)',
+  '@media (prefers-reduced-motion: reduce)',
+  ':focus-visible',
+  'var(--',
+], 'Medienbibliothek-CSS-Vertrag fehlt');
+
+expect(!/\bfetch\s*\(/.test(js), 'Additive Medien-UX darf keine eigenen Netzwerkaufrufe ausführen');
+expect(!/\bapi\s*\(/.test(js), 'Additive Medien-UX darf keine Vendoo-API direkt aufrufen');
+expect(!/\.innerHTML\s*=/.test(js), 'Medien-UX darf keine innerHTML-Zuweisungen verwenden');
+expect(!/\.outerHTML\s*=/.test(js), 'Medien-UX darf keine outerHTML-Zuweisungen verwenden');
+expect(!/\.onclick\s*=/.test(js), 'Medien-UX darf keine onclick-Zuweisungen verwenden');
+expect(!/confirm\s*\(/.test(js), 'Gefährliche Medienaktionen müssen in der bestehenden geprüften Logik bleiben');
+expect(!/DELETE|PATCH|POST|PUT/.test(js), 'Medien-UX darf keine Schreiboperationen implementieren');
+
+if (failures.length) {
+  console.error('Media Library UX Gate fehlgeschlagen:');
+  for (const failure of failures) console.error(`- ${failure}`);
+  process.exit(1);
+}
+
+console.log('Media Library UX Gate bestanden.');