Update AGENTS.md auto-update schedule to weekly on Mondays

[AndreiDrang]

Summary

• Обновлено расписание воркфлоу Zai AGENTS.md Auto-Update для запуска раз в неделю по понедельникам
• Изменено cron-выражение с 0 6 * * * (ежедневно) на 0 6 * * 1 (каждый понедельник в 06:00 UTC)

Verification

• Проверен текущий статус воркфлоу: Zai AGENTS.md Auto-Update работает успешно
• Изменения только в файле .github/workflows/zai-agents-update.yml

[github-actions]

Z.ai Code Review

## 🔍 Review Summary
The pull request correctly adjusts the CI/CD workflow schedule from daily to weekly (Mondays) and ensures the inline documentation matches the new cron syntax.

## 🚨 Critical Issues & Bugs
None detected.

## 💡 Suggestions & Best Practices
None detected.

## 📊 Final Assessment

• Rating: Good
• Reason: The cron syntax is correct (0 6 * * 1 runs at 06:00 UTC every Monday), and the code change is perfectly synchronized with the documentation comment.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.00%. Comparing base (6712038) to head (f9720eb).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #39   +/-   ##
=======================================
  Coverage   86.00%   86.00%           
=======================================
  Files          24       24           
  Lines        7204     7204           
=======================================
  Hits         6196     6196           
  Misses       1008     1008           

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