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

tests/unit/test_config_package.py

@@ -154,7 +154,7 @@ def test_llm_config_parsing_and_merging():
     assert isinstance(llm_cfg, LLMConfig)
     assert llm_cfg.planner.provider in ("google", "openai", "openrouter", "xai", "vertexai")
     assert llm_cfg.get_agent("planner") is not None
-    assert llm_cfg.get_utils("hopper") is not None
+    assert llm_cfg.get_utils("entity_extractor") is not None
 
     # Deep merge overrides
     overrides = {