more agressive early oom

nixosConfigurations/muede-lpt2/default.nix

@@ -34,6 +34,14 @@
     MemoryMax = lib.mkForce "80%";
   };
 
+  # Swap = 15.5GiB zram (used first) + 32GiB swapfile. Default earlyoom swap
+  # threshold (10% free) only fires after ~44GiB are used, i.e. deep into
+  # thrashing. 60% free ≈ zram full plus a few GiB of swapfile.
+  services.earlyoom = {
+    freeSwapThreshold = 60;
+    enableNotifications = true;
+  };
+
   services.xserver.xkb = {
     # Configure keymap in X11
     layout = "de";