fix: made the macos app smaller

lib/bds/release_packaging.ex

@@ -56,7 +56,8 @@ defmodule BDS.ReleasePackaging do
     app_release_source = Keyword.fetch!(opts, :app_release_source)
     mcp_release_source = Keyword.fetch!(opts, :mcp_release_source)
 
-    with :ok <- reset_output(metadata),
+    with :ok <- validate_release_source(app_release_source),
+         :ok <- reset_output(metadata),
          :ok <- copy_release(app_release_source, metadata.app_root),
          :ok <- copy_release(mcp_release_source, metadata.resources_root),
          :ok <- write_manifest(metadata),
@@ -65,6 +66,20 @@ defmodule BDS.ReleasePackaging do
     end
   end
 
+  @doc """
+  Rejects half-assembled releases. A failed `mix release` run can leave `lib/`
+  copied but no `releases/<version>/` (no `env.sh`, no boot scripts) — packaging
+  that produces an app that dies on launch. Refuse it up front instead.
+  """
+  def validate_release_source(release_dir) do
+    if release_dir |> Path.join("releases/*/env.sh") |> Path.wildcard() == [] do
+      {:error,
+       {:incomplete_release, "#{release_dir} has no releases/*/env.sh — did `mix release` fail?"}}
+    else
+      :ok
+    end
+  end
+
   defp normalize_platform(platform) when platform in [:macos, :linux, :windows], do: platform
   defp normalize_platform(:darwin), do: :macos