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First slice of BACKLOG #76 (hibernation + zram, split): zramSwap on by default in modules/nixos/oom.nix — the memory-pressure layer before earlyoom. zstd @ 50% RAM (nixpkgs defaults, explicit for reproducibility), priority 100 so day-to-day paging fills zram first and any disk swapfile stays reserved for #76's hibernate image (hibernation can't resume from volatile zram). Follows the earlyoom mkDefault precedent — no toggle. Adds checks.zram-swap runNixOSTest importing oom.nix, asserting the device is an active swap, uses [zstd], and carries priority 100. Verified: V2 checks.zram-swap PASS (/dev/zram0 in /proc/swaps, zstd, prio 100); V1 full distro toplevel builds; V0 flake check --no-build green. #76 remainder (disk swapfile default + resume + installer) still open. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>