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modules/nixos/oom.nix — running out of memory now kills the offending process (with a desktop notification via systembus-notify) instead of freezing the desktop for minutes until the kernel OOM killer fires. earlyoom over systemd-oomd, deliberately: oomd kills whole cgroups, and a Hyprland session runs as ONE scope (nothing here spawns per-app systemd scopes, unlike GNOME) — under pressure oomd would take out the entire desktop to save it. earlyoom kills the single largest process before the thrash point. nixpkgs default-enables oomd in an inert state (no slices monitored); it is disabled outright so there is one owner. Session plumbing is --avoid-listed (unanchored — NixOS wrappers rename comm to .foo-wrapped); no --prefer tuning, largest-RSS selection already finds the hog. All mkDefault; opt out with services.earlyoom.enable = false (README note added). Verified: V0 (flake check) + V2 — new checks.oom-protection runNixOSTest, executed: a chunked allocator (686 MB peak, 1 GB VM) is SIGTERM'd by earlyoom in 0.1 s, a bystander unit survives (the process-level granularity the module exists for), and systemd-oomd is asserted inactive. 25 s runtime. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>