Feature/perception-v2:
- New perception architecture with grounding system (SOM + text serialization)
- Android locator builder with filtering pipeline (bounds, hierarchy, interactive)
- Separated collectors (android/ios) with improved element collection
- Smart hierarchy filtering to reduce noise
- Improved prompts composition

Feature/tools-0.2:
- New screen tools (answer_text, answer_json, assert_screen)
- Reduced hallucination via programmatic tool selection
- Cleaner logging across tools
- Better tool descriptions