Remove internal prompt version metadata

internal/usecase/prepared_execution.go

@@ -128,7 +128,7 @@ func (r *Runner) RunPrepared(ctx context.Context, prepared *PreparedExecution) (
 		ctx = observation.WithRecorder(ctx, recorder)
 		selected := payload.prepared
 		recorder.UpdateSelection(observation.Selection{PromptID: selected.PromptID,
-			PromptVersion: selected.PromptVersion, ProfileID: selected.SelectedProfileID,
+			ProfileID: selected.SelectedProfileID,
 			BackendID: selected.SelectedBackendID, Model: selected.EffectiveModelParams.Model})
 		recorder.Start()
 		if idErr != nil {
@@ -229,7 +229,6 @@ func clonePreparedRun(source *domain.PreparedRun) (*domain.PreparedRun, error) {
 	}
 
 	copied := *source
-	copied.PromptVersion = copyStringPointer(source.PromptVersion)
 	extraParams, err := jsonvalue.CopyMap(source.EffectiveModelParams.ExtraParams)
 	if err != nil {
 		return nil, err