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

- Add NOTICE file and README license references for mobile-use and finalrun-agent
- Add derivative attribution headers to 17 files derived from mobile-use
- Rename hopper agent to entity_extractor across prompts, tools, and configs
- Remove obsolete adb_tunnel, ApiBaseUrl, and legacy CLI utility scripts
- Replace legacy examples with native Artemis diagnostic and workflow examples
- Update unit and tool tests to validate entity_extractor and SDK builders

artemis/utils/shell_utils.py

@@ -1,35 +0,0 @@
-# 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 subprocess
-
-
-def run_shell_command_on_host(command: str) -> str:
-    """Helper to run a shell command on the host and return the output."""
-    try:
-        result = subprocess.run(
-            command,
-            stdin=subprocess.DEVNULL,
-            shell=True,
-            check=True,
-            capture_output=True,
-            text=True,
-        )
-        return result.stdout.strip()
-    except subprocess.CalledProcessError as e:
-        # Log the error and stderr for better debugging
-        error_message = (
-            f"Command '{command}' failed with exit code {e.returncode}.\nStderr: {e.stderr.strip()}"
-        )
-        raise RuntimeError(error_message) from e