feat(perception): expose active app metadata in UI tree

tests/test_mcp.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from api.mcp import tool_handlers
+from core.models import ActiveApp
 from device.manager import DeviceManager
 from tests.fakes import FakeDriver
 
@@ -36,3 +37,30 @@ def test_mcp_handlers_are_semantic_and_hide_driver_terms() -> None:
     assert "Appium" not in serialized
     assert "XCUI" not in serialized
     assert all(response is not None for response in responses)
+
+
+def test_mcp_ui_tree_can_include_active_app_info() -> None:
+    manager = DeviceManager()
+    manager.register_device(
+        "android-1",
+        lambda: FakeDriver(
+            active_app=ActiveApp(
+                platform="android",
+                package="com.example.mobile",
+                activity=".MainActivity",
+            )
+        ),
+    )
+    manager.connect("android-1", max_retries=1)
+
+    response = tool_handlers(manager=manager)["get_ui_tree"](
+        device_id="android-1",
+        include_app_info=True,
+    )
+
+    assert response["app"] == {
+        "platform": "android",
+        "package": "com.example.mobile",
+        "activity": ".MainActivity",
+    }
+    assert isinstance(response["nodes"], list)