Validation of workspace member access control
Previous (Broken): Only admin/owner could call getWorkspaceUsers
→ Staff users got 403 Forbidden
Fixed (New): Any active workspace member can call getWorkspaceUsers for their workspace
→ Check: WorkspaceMember.exists(user_id, workspace_id, is_active=true)
Isolation: Non-members receive 403 for workspaces they don't belong to
Click "Run Validation" to test workspace member authorization