[EPIC] Phase 3: Agentic AI Enhancement

## Goal
Achieve 95-98% query coverage with Claude Agent SDK for complex patterns

## Complexity
HIGH - Advanced AI integration with learning and caching

## Key Deliverables
- Claude Agent SDK integration
- Semantic validation pipeline
- Pattern learning and caching
- Query classification router

## Success Criteria
- 95-98% query coverage
- AI translation success rate >90%
- Cache hit rate >60%