- Rename AutoEnhancer to Discoverer with clear element discovery focus
- Implement unified enhancement pipeline in Enhancer:
* Phase 1: Element Discovery (configurable, respects existing insertr classes)
* Phase 2: ID Generation via engine
* Phase 3: Content Injection via engine
- Add EnhancementConfig and DiscoveryConfig for flexible configuration
- Update all method names and references (discoverNode, DiscoveryResult, etc.)
- Support both manual class insertion and automatic discovery
- Maintain single enhance command interface while providing unified internal pipeline
- Update all constructors to use new configuration-based approach
This establishes the clean Discoverer + Enhancer architecture discussed, with discovery as configurable first phase and enhancement as unified pipeline.
