pgw#990 + pgw#988: adoption stops being a pilot — the gate is deleted, the declare/verify contract is split, and code_closure leaves the key (0.93.2) - #512

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, astral-sh/setup-uv@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/