feat(core): add cross-project knowledge transfer system

[nglebm19]

What problem this solves

Enables automatic knowledge sharing and synthesis across multiple projects with intelligent pattern recognition.

How you solved it

• Master guide engine for knowledge aggregation
• Project registry for cross-project tracking
• Knowledge synthesizer for intelligent analysis
• Integration with existing memory tools
• Comprehensive test suite and documentation

Breaking changes

None - new feature addition only

Testing performed

• All existing tests pass
• 90+ new tests with performance analysis
• Demo script validates functionality

Pull Request Checklist

• Code follows project style guidelines
• Self-review completed
• Tests added/updated and passing
• Documentation updated if needed
• No breaking changes (or clearly documented)
• Commits follow conventional format
• Branch is up to date with main

Related Issues

Closes #249