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.

artemis/utils/cli_helpers.py

@@ -0,0 +1,38 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import sys
+
+from adbutils import AdbClient
+from rich.console import Console
+
+
+def display_device_status(console: Console, adb_client: AdbClient | None = None):
+    """Checks for connected devices and displays the status."""
+    console.print("\n[bold]📱 Device Status[/bold]")
+    devices = None
+    if adb_client is not None:
+        devices = adb_client.device_list()
+    if devices:
+        console.print("✅ [bold green]Android device(s) connected:[/bold green]")
+        for device in devices:
+            console.print(f"  - {device.serial}")
+    else:
+        console.print("❌ [bold red]No Android device found.[/bold red]")
+        command = "emulator -avd <avd_name>"
+        if sys.platform not in ["win32", "darwin"]:
+            command = f"./{command}"
+            console.print(
+                f"You can start an emulator using a command like: [bold]'{command}'[/bold]"
+            )