// Package decision implements check, batch_check, list_allowed, and
// explain on top of the registry and policy packages.
//
// Decision envelopes carry effect, reason, matched policy version,
// matched rule, resource metadata, subject metadata, obligations,
// diagnostics, and provenance. Envelopes are identical for local and
// delegated evaluation per ADR-003.
//
// Implementation lands in FLEX-WP-0002 P2.4 and P2.5.
package decision