feat: expose workflow state events and persist signal transitions

weave/instance/service.go

@@ -72,6 +72,8 @@ type StepsView struct {
 	Steps      []StepView `json:"steps"`           // Steps 按键排序，最多128个，不含内部根检查点。
 }
 type Store interface {
+	ListEvents(context.Context, auth.Token, core.ID, service.HistoryPageInput) (EventPage, error)
+	GetEvent(context.Context, auth.Token, core.ID, core.ID) (EventDetail, error)
 	List(context.Context, auth.Token, ListInput) (Page, error)
 	ListActivations(context.Context, auth.Token, core.ID, string, service.HistoryPageInput) (ActivationPage, error)
 	GetActivation(context.Context, auth.Token, core.ID, string, core.ID) (ActivationDetail, error)