docs: enhance Codex analysis with comprehensive technical documentation

- Added detailed Agent Control System section with AgentControl and Guards
- Enhanced Multi-Agent Collaboration with complete spawn/wait/send/close handlers
- Added Responses WebSocket Transport and Connectors sections
- Improved ExecPolicy documentation with Decision types (Allow/Prompt/Forbidden)
- Added comprehensive Summary of Recommendations section with action timeline
- Reorganized table of contents with new sections 13-17
- Updated feature flags documentation with January 2026 analysis
- Added IDE integration comparison (VS Code, Cursor, Windsurf)
- Enhanced network proxy SSRF protection documentation with all RFC ranges
- Added CollaborationModeMask and ModeKind documentation

Author: factorydroid