fa2c9968e6
- Implement PermissionChecker for workspace access control - Define Permission constants for all operations - Define ROLE_PERMISSIONS mapping (Owner/Admin/Member/Viewer) - Support workspace/member/project/asset permission checks - Helper functions: check_is_owner, check_can_manage_members, etc. - Add 15 comprehensive unit tests (all passed) Phase 4 Task 20/68 completed