docs: update project documentation with Phase 3 + Claude SDK integration status

Documentation now reflects both completed and in-progress work:

✅ Phase 3 Foundation (100% Complete - Nov 20, 2025):
- Multi-language adapter system (Python, Go, Rust)
- Multi-model provider system (89% cost savings)
- JSON validation service (FastAPI + Pydantic v2)
- RunPod deployment configuration
- GitHub OAuth integration
- 197 tests passing

🚧 Claude SDK Integration (70% Complete - Nov 22, 2025):
- CostOptimizerClient with circuit breaker (91% cost savings)
- Conversational chat interface for non-technical users
- Requirements extraction from natural language
- Complete end-to-end flow (chat → agents)
- Production-ready security fixes
- 86+ tests passing

Updated files:
- CLAUDE.md: Added Claude SDK Integration section after Phase 3
- .claude/context.md: Comprehensive update with both projects

Status: Phase 3 Complete ✅ | Claude SDK Integration 70% 🚧
Next: RunPod deployment, health check endpoint, documentation polish

🚀 Generated with Claude Code (https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ScientiaCapital