Add activationPackage

flake.nix

@@ -78,6 +78,17 @@
 
     homeManagerModules.default = ./modules/home;
 
+    # Expose each host's HM activation package so `home-manager switch --flake .#muon@<host>`
+    # works without a full NixOS rebuild.  Extracted from the already-evaluated
+    # nixosConfiguration, so osConfig remains fully populated.
+    homeConfigurations = nixpkgs.lib.mapAttrs' (host: nixos:
+      nixpkgs.lib.nameValuePair "muon@${host}" {
+        activationPackage = nixos.config.home-manager.users.muon.home.activationPackage;
+      }
+    ) (nixpkgs.lib.filterAttrs
+        (_: nixos: nixos.config.home-manager.users ? muon)
+        inputs.self.outputs.nixosConfigurations);
+
     colmena = {
       meta = {
         nixpkgs = import inputs.nixpkgs {inherit system;};

modules/nixos/core/nix.nix

@@ -51,6 +51,7 @@
 
     environment.systemPackages = with pkgs; [
       inputs.nix-alien.packages.${system}.nix-alien
+      inputs.home-manager.packages.${system}.home-manager
       colmena
     ];
     programs.nix-ld.enable = true;