feat(S15P11A705-402): 재정렬 후보 불변 계약과 게이트 계약을 분리 명시한다 - #122

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683, actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065, docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83, docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/