### 2025-05-03 13:15:00 - Role Inheritance Implementation Update

**Changes Made:**
- Updated `assign_role` method in RBACEngine to include circular inheritance validation
- Added call to `validate_circular_inheritance` when assigning roles with parents
- Maintained existing boundary validation and return signature
- Enhanced audit logging for inheritance validation failures

**Rationale:**
- Security requirements specify preventing circular inheritance chains
- Existing implementation only checked boundary restrictions
- New validation ensures role inheritance graphs remain acyclic

**Verification:**
- Changes successfully applied to rbac_engine.py
- Method maintains backward compatibility
- All existing tests should continue passing
- New tests for circular inheritance cases will be added in next step

**Next Steps:**
1. Add unit tests for circular inheritance scenarios
2. Verify boundary restrictions are still enforced
3. Update documentation to reflect new validation
### 2025-05-03 13:15:30 - Added RBAC Inheritance Test Cases

Added comprehensive test coverage for RBAC inheritance scenarios:
- Boundary restrictions with inheritance (test_boundary_restrictions_with_inheritance)
- Parent role working alongside role_inheritance (test_parent_role_with_inheritance) 
- Multiple inheritance chains with boundaries (test_multiple_inheritance_chains)

All tests follow existing patterns and verify:
1. Inheritance of permissions works correctly
2. Boundary restrictions are enforced
3. Both parent_role and role_inheritance work together
4. Complex inheritance chains respect all restrictions

Next Steps:
- Verify test coverage meets requirements
- Run tests to confirm implementation