lib/transitions supports state-machine style flows for asset lifecycle (stock, deployment, retirement paths inferred from naming).
lib/custom_fields, lib/permissions, lib/hooks, lib/polymorphic patterns mirror enterprise CMDB flexibility—operators extend models without constant schema forks.
lib/visibility_scope suggests row-level or scope-limited visibility rules for large organizations.
Source A centralizes network-domain extensibility (relationships, Git, jobs). Source D centralizes asset and procurement extensibility with DC visualization.