Revert "refactor: clean up legacy code, rename hopper to entity_extractor, and add third-party notices"

This reverts commit 54fcef9887.

Please do not submit unrelated docs and codes in the same commit. I am reverting this commit so that the related files can be submitted in better-organized future commits.

tests/unit/mcp/test_mcp_stdio_lifecycle.py

@@ -24,8 +24,11 @@ import queue
 import subprocess
 import sys
 import threading
+import time
 from unittest.mock import MagicMock, patch
 
+import pytest
+
 from artemis.clients import ui_automator_client
 from artemis.runtime.awake_lease import ScreenAwakeLease
 from artemis.runtime.awake_service import _run_awake_adb_command
@@ -201,12 +204,16 @@ def test_device_utils_isolates_stdin():
 
 
 def test_ui_automator_client_isolates_stdin():
-    """Verify ui_automator_client screencap commands isolate stdin."""
-    client = ui_automator_client.UIAutomatorClient("dev-1")
+    """Verify ui_automator_client helper commands isolate stdin."""
     with patch("artemis.clients.ui_automator_client.subprocess.run") as mock_run:
-        mock_run.return_value = MagicMock(returncode=0, stdout=b"", stderr="")
-        with patch("artemis.clients.ui_automator_client.Image.open"):
-            client.get_screenshot()
+        mock_run.return_value = MagicMock(returncode=0, stdout="package:com.test\n", stderr="")
+        ui_automator_client._is_package_installed("dev-1", "com.test")
+        assert mock_run.called
+        assert mock_run.call_args.kwargs.get("stdin") == subprocess.DEVNULL
+
+    with patch("artemis.clients.ui_automator_client.subprocess.run") as mock_run:
+        mock_run.return_value = MagicMock(returncode=0, stdout="", stderr="")
+        ui_automator_client._uninstall_package("dev-1", "com.test")
         assert mock_run.called
         assert mock_run.call_args.kwargs.get("stdin") == subprocess.DEVNULL