docs: Add comprehensive README and PROTOCOLS documentation

Complete transformation of documentation to reflect actual implementation:

## Documentation Added

### README.md
- Accurate feature list (what actually works vs roadmap)
- Complete protocol architecture diagram
- Installation instructions (verified working)
- Quick start guides for all major features
- Ultra member value proposition
- Quantum computing roadmap
- Real code examples for all protocols
- Project statistics and acknowledgments

### PROTOCOLS.md
- Complete A2A protocol implementation guide
- AP2 payment protocol with all mandate types
- MCP server management documentation
- Integration patterns (A2A+AP2, A2A+MCP, Full Stack)
- Security best practices
- Performance optimization tips
- Error handling examples
- Production-ready code samples

## What's Documented

✅ A2A Protocol: Agent discovery, negotiation, task execution
✅ AP2 Protocol: Intent, Cart, Recurring payments + refunds
✅ MCP Integration: 9 servers, lifecycle management
✅ Gemini Services: Flash, Pro, Ultra with streaming
✅ Playwright Automation: AI Studio, Labs Flow/Whisk
✅ Quantum Computing: Circuit builder, gates, pre-built circuits
✅ TUI Interface: Service grid, status, workflows
✅ Installation: Fixed and verified working

## Documentation Philosophy

- Honest about current vs future capabilities
- Every example is runnable code
- Clear separation of API vs Playwright services
- Quantum positioned as ready foundation, not vaporware
- Ultra membership value clearly articulated

This documentation makes gemini-flow accessible to the 11,000+ LinkedIn
viewers and establishes it as a serious, protocol-based orchestration platform.

Author: claude