Add advanced AD security detection features via TDD

[DotNetRussell]

• Implement Shadow Credentials detection for users with KeyCredentialLink
• Add GPO content parsing to identify exploitable settings (e.g., Scheduled Tasks)
• Introduce Constrained Delegation detection for computers with delegation configs
• Add LAPS status detection to check for Local Administrator Password Solution
• Extend severity scoring and CLI args for new features
• Add YAML export support for reports
• Include abuse suggestion panels with mitigation advice for each new feature
• Add 8 comprehensive unit tests (totaling 50) and corresponding test data
• Update README and requirements.txt to reflect changes

Features implemented following Red-Green-Blue TDD, enhancing BloodBash's AD attack path analysis capabilities.