October 2026 integration: import check (#656), quorum reduction (#617), final-review PRs, sentry/timeout/export/import-lock fixes - #659

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, dorny/paths-filter@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/