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/task_tree.py

@@ -739,7 +739,7 @@ def _render_step_detailed(
     INTERNAL_SYSTEM_TOOLS = {
         "safety_net_validation",
         "safety_net_pixel_validation",
-        "hopper",
+        "entity_extractor",
     }
 
     if interleaved: