replications
Per-item replication-level snapshots in completion order, keyed by the item name — specifically SimulationSnapshot.ExperimentCompleted.experiment.exp_name on the corresponding entry in snapshots. Each value is the list of SimulationSnapshot.ReplicationCompleted snapshots collected during that item's run, in replication order.
Both ScenarioOrchestrator (per-scenario) and ExperimentOrchestrator (per-design-point) populate this map so multi-item consumers — the Comparison Analyzer tab, the Reports tab's per-replication box plots, the Regression tab — can reconstruct per-replication observations uniformly regardless of which orchestrator produced the batch. Defaults to an empty map for callers that don't supply one.