feat: add home-manager module for programs.bulkgen.enable

Expose homeManagerModules.bulkgen and homeManagerModules.default
from the flake. The module provides programs.bulkgen.enable and
programs.bulkgen.package options, adding bulkgen to home.packages
when enabled.

flake.nix

@@ -25,6 +25,7 @@
 
   outputs =
     {
+      self,
       nixpkgs,
       pyproject-nix,
       uv2nix,
@@ -105,14 +106,20 @@
           pkgs = nixpkgs.legacyPackages.${system};
           inherit (pkgs.callPackages pyproject-nix.build.util { }) mkApplication;
         in
-        {
+        rec {
-          default = mkApplication {
+          bulkgen = mkApplication {
             venv = pythonSet.mkVirtualEnv "bulkgen-env" workspace.deps.default;
             package = pythonSet.bulkgen;
           };
+          default = bulkgen;
         }
       );
 
+      homeManagerModules = rec {
+        bulkgen = import ./nix/hm-module.nix self;
+        default = bulkgen;
+      };
+
       checks = forAllSystems (
         system:
         let

nix/hm-module.nix

@@ -0,0 +1,20 @@
+self:
+{
+  lib,
+  pkgs,
+  config,
+  ...
+}:
+let
+  cfg = config.programs.bulkgen;
+in
+{
+  options.programs.bulkgen = {
+    enable = lib.mkEnableOption "bulkgen";
+    package = lib.mkPackageOption self.packages.${pkgs.system} "bulkgen" { };
+  };
+
+  config = lib.mkIf cfg.enable {
+    home.packages = [ cfg.package ];
+  };
+}