Description

Human-readable description. On a Capability it explains what the command group does; on a CapabilityCommand it explains the subcommand; on an InstallStep it notes prerequisites, what the step does, or any post-install action. No `domain` is asserted — this is a broadly-applicable annotation property used across multiple classes (Capability, CapabilityCommand, InstallStep, and likely others). Same posture as `rdfs:comment`.