@type t() :: %Autonomic.CapabilityLease{
  authority_ref: String.t() | nil,
  authority_source:
    :signed_policy | :slow_verifier | :human | :parent_capability,
  capabilities: [Autonomic.Capability.t()],
  episode_id: Autonomic.Contracts.episode_id(),
  epoch: Autonomic.Contracts.epoch(),
  expires_at: integer(),
  id: Autonomic.Contracts.lease_id(),
  issued_at: integer(),
  max_effect_class: Autonomic.Contracts.effect_class(),
  metadata: map(),
  policy_version: Autonomic.Contracts.policy_version(),
  reason: String.t() | nil,
  revoked_at: integer() | nil
}