hydra-common

Foundation contracts for the Hydra workspace: engine identity (descriptor + registry), the reportable-output contract by which engines describe and produce report content, and, since a second engine exists to validate them, the element-taxonomy, quantity, result-variable and criteria contracts (spec §4 to §7). Depends on nothing else in the workspace; every engine and application may depend on it.

Deliberately slim: engine meaning travels only through opaque ids and engine-authored text, and a cross-engine simulation session contract remains an explicit non-goal. See src/spec.md for the authoritative contract specification.

This crate is re-exported through hydra-sdk as hydra::common; depend on the SDK rather than on this crate directly.