fix(stack_verify_all): 증인 계층을 조용히 건너뛰고 ALL OK 를 냈다 - #36

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-python@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/