feat: mcp server first take

test/bds/mcp_agent_config_test.exs

@@ -0,0 +1,76 @@
+defmodule BDS.MCPAgentConfigTest do
+  use ExUnit.Case, async: false
+
+  alias BDS.MCP.AgentConfig
+
+  setup do
+    home_dir = Path.join(System.tmp_dir!(), "bds-mcp-home-#{System.unique_integer([:positive])}")
+    File.mkdir_p!(home_dir)
+    on_exit(fn -> File.rm_rf(home_dir) end)
+    %{home_dir: home_dir}
+  end
+
+  test "github copilot config uses VS Code mcp.json servers format with stdio entry", %{home_dir: home_dir} do
+    install_root = Path.join(home_dir, "bDS2.app/Contents/Resources")
+    executable_path = Path.join(install_root, "mcp/bin/bds-mcp")
+
+    assert {:ok, result} =
+             AgentConfig.add_to_config(:github_copilot,
+               home_dir: home_dir,
+               install_root: install_root,
+               platform: :macos
+             )
+
+    assert File.exists?(result.config_path)
+    written = Jason.decode!(File.read!(result.config_path))
+
+    assert written["servers"]["bDS"] == %{
+             "type" => "stdio",
+             "command" => executable_path,
+             "args" => []
+           }
+  end
+
+  test "claude code config uses mcpServers format and preserves other entries", %{home_dir: home_dir} do
+    config_path = Path.join(home_dir, ".claude.json")
+    install_root = Path.join(home_dir, "dist")
+
+    File.write!(
+      config_path,
+      Jason.encode!(%{"mcpServers" => %{"other" => %{"command" => "python"}}, "theme" => "dark"})
+    )
+
+    assert {:ok, result} =
+             AgentConfig.add_to_config(:claude_code,
+               home_dir: home_dir,
+               install_root: install_root,
+               platform: :linux
+             )
+
+    written = Jason.decode!(File.read!(result.config_path))
+    assert written["theme"] == "dark"
+    assert written["mcpServers"]["other"] == %{"command" => "python"}
+    assert written["mcpServers"]["bDS"] == %{"command" => Path.join(install_root, "mcp/bin/bds-mcp"), "args" => []}
+  end
+
+  test "packaged executable path resolves inside the distributable payload" do
+    assert AgentConfig.packaged_executable_path("/Applications/bDS2.app/Contents/Resources", :macos) ==
+             "/Applications/bDS2.app/Contents/Resources/mcp/bin/bds-mcp"
+
+    assert AgentConfig.packaged_executable_path("C:/Program Files/bDS2/resources", :windows) ==
+             "C:/Program Files/bDS2/resources/mcp/bin/bds-mcp.bat"
+
+    assert AgentConfig.packaged_executable_path("/opt/bds2", :linux) ==
+             "/opt/bds2/mcp/bin/bds-mcp"
+  end
+
+  test "release config exposes a dedicated distributable mcp release" do
+    project = BDS.MixProject.project()
+    releases = Keyword.fetch!(project, :releases)
+    mcp_release = Keyword.fetch!(releases, :bds_mcp)
+
+    assert Keyword.fetch!(project, :default_release) == :bds
+    assert Keyword.fetch!(mcp_release, :include_executables_for) == [:unix, :windows]
+    assert Path.join(Keyword.fetch!(mcp_release, :path), "bin") =~ "rel/bds_mcp"
+  end
+end