AbstractOptionalagentWhen set, the current lambda in the builder was produced by the Legend
AI agent chat (via "Load query into builder") and this is the trace_id
the agent surfaced in its response. Downstream telemetry providers can
pick this up to correlate save / update / run events to the agent
conversation that produced them. In-memory only; not persisted.
NOTE: subclasses are responsible for registering this field as
observable (and setAgentChatTraceId as action) in their own
makeObservable call — mobx does not support multiple makeObservable
invocations across an inheritance chain on the same instance.
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