Ring deployments for sklils

### Feature summary

_No response_

### What problem are you trying to solve?

Currently if we do roll out skills we make all of them available for everyone. We can't text out new skills without affecting all users

### Proposed solution

Staff-gated skills

### Workflow impact

_No response_

### Installation context

_No response_

### Additional context

_No response_

Issue 中没有确定任何文件、测试或入口点。首先明确 skills 的表示方式以及可用性由何处控制，然后定义由 staff 审批的 rollout 工作流及其验证标准，再定位相关的实现和测试。

由索引模型根据 Issue 内容生成。