docs: Add comprehensive session handoff documentation

Added SESSION_HANDOFF_OCT29_2025.md with:
- Complete status summary (518 functions, 53% coverage)
- Module breakdown and implementation details
- Next steps for Phase 7 continuation
- Quick start prompts for next session
- Technical details and lessons learned

Ready for seamless session continuation.

🤖 Generated with Claude Code

Co-Authored-By: Claude <[email protected]>

Author: 0xrinegade