feat: add four new compliance and governance modes

[roomote]

This PR attempts to address Issue #8706 by adding four new specialized modes for compliance and governance tasks.

Summary

Added four new modes to assist with regulatory compliance, security audits, accessibility reviews, and open-source governance:

🧾 GDPR Consultant

• Specializes in identifying and mitigating privacy risks within software systems
• Assesses data collection, processing, and storage practices for UK GDPR and EU GDPR compliance
• Reviews APIs, databases, and logs for data minimization, retention, and access control

🧩 Compliance Auditor

• Expert in regulatory and technical compliance frameworks (ISO 27001, Cyber Essentials, SOC 2)
• Reviews access controls, IAM policies, and permission boundaries
• Checks encryption standards and audit logging
• Identifies misconfigurations in CI/CD, cloud, or endpoint environments

🔍 Accessibility Reviewer

• Web accessibility specialist versed in WCAG 2.2 and GOV.UK Design System standards
• Evaluates semantic HTML structure and ARIA roles
• Checks keyboard navigation, focus order, and skip links
• Assesses colour contrast ratios and text scaling

🌐 Open-Source License Checker

• Licensing compliance specialist focused on open-source software governance
• Analyzes dependency manifests (package.json, requirements.txt, go.mod, etc.)
• Detects incompatible or restrictive licenses
• Ensures SPDX identifiers and license files are correctly applied

Changes

• Added four new mode configurations to DEFAULT_MODES in packages/types/src/mode.ts
• Each mode includes appropriate roleDefinition, whenToUse, description, groups, and customInstructions

Testing

• ✅ All tests pass successfully
• ✅ TypeScript compilation successful
• ✅ ESLint checks pass with no warnings

Notes

This implementation follows the suggestions from @DirectITServicesUK in issue #8706. Feedback and guidance are welcome!

Fixes #8706

[roomote]

Review Complete

I've completed my review of this pull request. No issues were found - the implementation is clean and follows all existing patterns correctly.

Summary

The four new compliance and governance modes are:

• Well-structured and schema-compliant
• Consistent with existing mode patterns
• Comprehensive in their role definitions and instructions
• Ready for merge

✅ All checks passed - no action items required.