rlmesh_recorder_workloads_get
export returns owned UTF-8 path bytes. Refused targets and I/O fail with ERR_OS. After close, exporting removed staged media fails ERR_RUNTIME; exporting metrics without staged media still works.
RLMeshStatus rlmesh_recorder_workloads_get(
const RLMeshRecorder* recorder,
size_t i,
RLMeshWorkloadRecord** out
)