feat: mcp server first take

test/bds/scripting/api_test.exs

@@ -0,0 +1,70 @@
+defmodule BDS.Scripting.ApiTest do
+  use ExUnit.Case, async: false
+
+  setup do
+    :ok = Ecto.Adapters.SQL.Sandbox.checkout(BDS.Repo)
+
+    temp_dir =
+      Path.join(System.tmp_dir!(), "bds-scripting-api-#{System.unique_integer([:positive])}")
+
+    File.mkdir_p!(temp_dir)
+    on_exit(fn -> File.rm_rf(temp_dir) end)
+
+    {:ok, project} = BDS.Projects.create_project(%{name: "Scripting API", data_path: temp_dir})
+
+    %{project: project}
+  end
+
+  test "project capabilities expose current backend data through explicit bds namespaces", %{
+    project: project
+  } do
+    assert {:ok, post} =
+             BDS.Posts.create_post(%{
+               project_id: project.id,
+               title: "Capability Post",
+               content: "Body",
+               language: "en",
+               tags: ["elixir"],
+               categories: ["article"]
+             })
+
+    assert {:ok, _published_post} = BDS.Posts.publish_post(post.id)
+    assert {:ok, _tags} = BDS.Tags.sync_tags_from_posts(project.id)
+
+    source = [
+      "function main()",
+      "  local meta = bds.meta.get_project_metadata()",
+      "  local fetched = bds.posts.get_by_slug('capability-post')",
+      "  local tags = bds.tags.get_all()",
+      "  return {",
+      "    project_name = meta.name,",
+      "    post_title = fetched.title,",
+      "    tag_count = #tags",
+      "  }",
+      "end"
+    ]
+    |> Enum.join("\n")
+
+    assert {:ok, %{"project_name" => "Scripting API", "post_title" => "Capability Post", "tag_count" => 1}} =
+             BDS.Scripting.execute_project_script(project.id, source, "main")
+  end
+
+  test "macro execution uses explicit project capabilities and degrades failures to empty output", %{
+    project: project
+  } do
+    source = [
+      "function render()",
+      "  local meta = bds.meta.get_project_metadata()",
+      "  return '<strong>' .. meta.name .. '</strong>'",
+      "end"
+    ]
+    |> Enum.join("\n")
+
+    assert {:ok, "<strong>Scripting API</strong>"} =
+             BDS.Scripting.execute_macro(project.id, source, [])
+
+    bad_source = "function render() error('boom') end"
+
+    assert {:ok, ""} = BDS.Scripting.execute_macro(project.id, bad_source, [])
+  end
+end