cmd: remove hpkg

This proof-of-concept was abandoned long ago. Its test suite is flaky, heavy on I/O and does not increase test coverage. This change fully removes hpkg and supporting code.

Signed-off-by: Ophestra <cat@gensokyo.uk>

package.nix

@@ -16,11 +16,6 @@
   # for sharefs
   fuse3,
 
-  # for hpkg
-  zstd,
-  gnutar,
-  coreutils,
-
   # for passthru.buildInputs
   go,
   clang,
@@ -128,18 +123,6 @@ buildGoModule rec {
 
       makeBinaryWrapper "$out/libexec/hakurei" "$out/bin/hakurei" \
         --inherit-argv0 --prefix PATH : ${lib.makeBinPath appPackages}
-
-      makeBinaryWrapper "$out/libexec/hpkg" "$out/bin/hpkg" \
-        --inherit-argv0 --prefix PATH : ${
-          lib.makeBinPath (
-            appPackages
-            ++ [
-              zstd
-              gnutar
-              coreutils
-            ]
-          )
-        }
     '';
 
   passthru.targetPkgs = [