Remove unavailable crash analysis packages.

The crash and makedumpfile packages don't exist in nixpkgs.
Kdump will still capture crash dumps to /var/crash.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

hosts/beefy/default.nix

@@ -50,7 +50,4 @@
   environment.persistence.${config.custom.impermanence.persistPath}.directories = [
     "/var/crash"
   ];
-
-  # Crash analysis tools
-  environment.systemPackages = with pkgs; [ crash makedumpfile ];
 }