- Enhanced ACCESS_LAYER_AND_GOVERNANCE_PLAN.md with additional details on heuristic checks and testing procedures for cross-tenant scenarios.
- Updated club_tenancy.py to recommend using `library_content_visible_to_profile` for exercise visibility checks.
- Refactored multiple routers to utilize `library_content_visible_to_profile`, improving consistency in access control across exercises and training planning.
- Bumped application version to 0.8.28 and updated changelog to reflect these changes.
