feat(validation): Add comprehensive documentation validation suite
- Introduced a new directory for validation tools within the project management thematic area.
- Created README.md to outline the validation process, including automated and manual checks.
- Developed individual validation scripts for file size, link integrity, and heading structure.
- Implemented a main validation script to run all checks and generate a consolidated report.
- Added a manual validation template for thorough documentation review.
- Established guidelines for running regular validations and integrating them into the documentation workflow.
- Included example PRD and task complexity report for better project management and task breakdown.