--slot-save-path + --cache-reuse 256 on both duo members, ./kv-cache mounted at /cache. Measured on ornith (3K-token system prompt): warm prefix reuse 296ms vs 106.7s cold prefill (361x); slot save 84MB in 59ms, GDN recurrent state serializes. scripts/duo-warmboot.sh wraps save/restore/status via llama-swap /upstream passthrough. Restore after restart: run 'duo-warmboot.sh restore' post stack boot. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>