feat: add comprehensive OIDC requirements specification

📋 Change summary:
* Add specs/claude-dev-toolkit-oidc-requirements.md (697 lines)
* Remove outdated claude-dev-toolkit/REFACTORING-SUMMARY.md
* Remove outdated docs/hybrid-hook-architecture.md

Adds detailed EARS-format requirements for GitHub Actions OIDC
integration with AWS, including CLI framework integration,
security validation, and comprehensive policy management.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: PaulDuvall