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

config/artemis.jsonc

@@ -93,8 +93,8 @@
     // 📋 Summarizer: Aggregates step history and generates structured outcome
     "summarizer": {},
 
-    // 🔽 Hopper: Fast lightweight package name locator
-    "hopper": {
+    // 🔍 Entity Extractor: Fast lightweight package name locator and entity extractor
+    "entity_extractor": {
       "model": "gemini-3.5-flash-lite",
       "fallback": {
         "provider": "google",