fix: withdrawal pending-state guards, cancel entrypoint, security headers, and single shutdown path (#1680, #1681, #1676, #1675) - #1705

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