Current agent run ID for tracing
OptionalOnReceives the rerank step as soon as it is created, so the agent run can count it. See
RerankObservabilityOptions.OnStepCreated.
OptionalparentParent step ID for hierarchical step logging
OptionalstepStep sequence number for the rerank step
Options for observability integration when retrieving notes or examples: the rerank step's run, parent and number.