feat: build infrastructure

Co-authored-by: Copilot <copilot@github.com>

test/bds/release_packaging_test.exs

@@ -0,0 +1,74 @@
+defmodule BDS.ReleasePackagingTest do
+  use ExUnit.Case, async: false
+
+  alias BDS.ReleasePackaging
+
+  setup do
+    base_dir = Path.join(System.tmp_dir!(), "bds-release-packaging-#{System.unique_integer([:positive])}")
+    output_dir = Path.join(base_dir, "dist")
+    app_release = Path.join(base_dir, "rel/bds")
+    mcp_release = Path.join(base_dir, "rel/bds_mcp")
+
+    File.mkdir_p!(Path.join(app_release, "bin"))
+    File.mkdir_p!(Path.join(mcp_release, "mcp/bin"))
+    File.write!(Path.join(app_release, "bin/bds"), "app-release")
+    File.write!(Path.join(mcp_release, "mcp/bin/bds-mcp"), "mcp-release")
+
+    on_exit(fn -> File.rm_rf(base_dir) end)
+
+    %{base_dir: base_dir, output_dir: output_dir, app_release: app_release, mcp_release: mcp_release}
+  end
+
+  test "build metadata uses a clean future-app payload layout" do
+    metadata = ReleasePackaging.build_metadata(:macos, "0.1.0", "/tmp/out")
+
+    assert metadata.platform == :macos
+    assert metadata.version == "0.1.0"
+    assert metadata.archive_path =~ ".tar.gz"
+    assert metadata.payload_root =~ "bds2-macos-0.1.0"
+    assert metadata.resources_root == Path.join(metadata.payload_root, "resources")
+    assert metadata.mcp_root == Path.join(metadata.payload_root, "resources/mcp")
+    assert metadata.app_root == Path.join(metadata.payload_root, "app")
+  end
+
+  test "package creates payload manifest and copies app and mcp releases", context do
+    assert {:ok, metadata} =
+             ReleasePackaging.package(
+               platform: :macos,
+               version: "0.1.0",
+               output_dir: context.output_dir,
+               app_release_source: context.app_release,
+               mcp_release_source: context.mcp_release
+             )
+
+    assert File.exists?(Path.join(metadata.app_root, "bin/bds"))
+    assert File.exists?(Path.join(metadata.mcp_root, "bin/bds-mcp"))
+    assert File.exists?(Path.join(metadata.payload_root, "manifest.json"))
+
+    manifest = metadata.payload_root |> Path.join("manifest.json") |> File.read!() |> Jason.decode!()
+
+    assert manifest == %{
+             "platform" => "macos",
+             "version" => "0.1.0",
+             "layout" => %{
+               "app" => "app",
+               "resources" => "resources",
+               "mcp" => "resources/mcp"
+             }
+           }
+  end
+
+  test "package creates a platform archive for redistribution", context do
+    assert {:ok, metadata} =
+             ReleasePackaging.package(
+               platform: :windows,
+               version: "0.1.0",
+               output_dir: context.output_dir,
+               app_release_source: context.app_release,
+               mcp_release_source: context.mcp_release
+             )
+
+    assert File.exists?(metadata.archive_path)
+    assert String.ends_with?(metadata.archive_path, ".zip")
+  end
+end