emacsPackages: revert throw

We recently retired a lot of old aliases, but emacsPackages is still
exposed on search.nixos.org, so should not have been removed. I argued
previously, that this should not have been an alias in the first place:
If it's exposed on search.nixos.org, then it is expected to be used,
too.

We will also need that once we teach Eval to evaluate more packages than
hydra builds.

pkgs/top-level/aliases.nix

@@ -520,7 +520,6 @@ mapAliases {
   elm-github-install = throw "'elm-github-install' has been removed as it is abandoned upstream and only supports Elm 0.18.0"; # Added 2025-08-25
   emacsMacport = throw "'emacsMacport' has been renamed to/replaced by 'emacs-macport'"; # Converted to throw 2025-10-27
   emacsNativeComp = throw "'emacsNativeComp' has been renamed to/replaced by 'emacs'"; # Converted to throw 2025-10-27
-  emacsPackages = throw "'emacsPackages' has been renamed to/replaced by 'emacs.pkgs'"; # Converted to throw 2025-10-27
   embree2 = throw "embree2 has been removed, as it is unmaintained upstream and depended on tbb_2020"; # Added 2025-09-14
   EmptyEpsilon = throw "'EmptyEpsilon' has been renamed to/replaced by 'empty-epsilon'"; # Converted to throw 2025-10-27
   emulationstation = throw "emulationstation was removed due to numerous vulnerabilities in freeimage"; # Added 2025-10-23

pkgs/top-level/all-packages.nix

@@ -10937,6 +10937,10 @@ with pkgs;
       pkgs' = pkgs; # default pkgs used for bootstrapping the emacs package set
     };
 
+  # emacsPackages is exposed on search.nixos.org.
+  # Also see pkgs/top-level/packages-config.nix
+  emacsPackages = dontRecurseIntoAttrs emacs.pkgs;
+
   espeak-classic = callPackage ../applications/audio/espeak { };
 
   espeak = espeak-ng;