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/config/constants.py

@@ -62,6 +62,7 @@ ENV_API_KEY = "API_KEY"
 ENV_OPENAI_API_KEY = "OPENAI_API_KEY"
 ENV_OPENAI_BASE_URL = "OPENAI_BASE_URL"
 ENV_ANTHROPIC_API_KEY = "ANTHROPIC_API_KEY"
+ENV_OPENROUTER_API_KEY = "OPENROUTER_API_KEY"
 ENV_OPEN_ROUTER_API_KEY = "OPEN_ROUTER_API_KEY"
 ENV_XAI_API_KEY = "XAI_API_KEY"
 
@@ -125,7 +126,7 @@ ExplorerVersion = Literal["flash", "pro", "ultra"]
 
 LLMUtilsNode = Literal[
     "outputter",
-    "hopper",
+    "entity_extractor",
     "video_analyzer",
     "object_detector",
 ]