Constant AGENT_FEATURE_CLASS_TAXONOMY 

pub const AGENT_FEATURE_CLASS_TAXONOMY: &[&str];

The DR-0015 agent feature-class taxonomy, verbatim (spec/std-agent.md “Capability reports”). Shared vocabulary: the parser checks requires [<feature.class>] membership against it (slice 6), and the kernel’s compiled provider feature reports may only state these classes (slice 5) — one list, no drift.