EXTENSIONS

A neutral, extensible fleet inventory record — the foundational "what exists and its declared attributes" model. Uniform core (id, purpose, components, relations) across atomic and composite items, with an open facet seam (access, power, network, config, management, firmware, interfaces, + custom) so new dimensions layer on without schema changes. Declarative: `apply` materialises one CEL-queryable `device` resource per id; `prune` soft-retires undeclared devices (status change, not deletion — version history preserves the lifecycle trend). Consumer abstractions (telemetry, management, config-drift) depend on it; it depends on nothing.