sessions: session memory for paged-KV families (page pool, prefix trie, RAM residency budget, streamed NVMe tier) (DeepSeek-V4.1 stack 4/14) - #637

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, mlugg/setup-zig@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/