The eigent package directory was deleted in 96f5d7f (which was titled
"chore: update n8n, openwork, vibetyper") but the callPackage reference
in pkgs/default.nix and the row in docs/packages/README.md were left
behind. As a result `nix build .#eigent` and `nix flake check` failed
with "undefined variable" errors when the eigent attribute was forced.
Drop both references so the package set evaluates cleanly.