AITrace-owned evidence facade for distributed StackLab profiles.
Trace export can be buffered or executed through a configured export transport. The facade validates bounded evidence envelopes and returns serializable refs for proof readback.
@spec export_trace( map(), keyword() ) :: {:ok, map()} | {:error, map()}
@spec owner_group() :: {module(), :evidence}
@spec read_export( String.t(), keyword() ) :: {:ok, map()} | {:error, map()}