完成政策金融组 Phase 6：producer scope 设计落地、审计补齐与质量改进；同步 GitHub 搜索增强、降级兜底与熔断运行时 相关机制 - #67

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4, pnpm/action-setup@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/