feat: expose workflow state events and persist signal transitions

internal/transport/httpserver/workflow_events.go

@@ -0,0 +1,27 @@
+package httpserver
+
+import (
+	"net/http"
+
+	core "git.yuntuo.hk/k2safe/orbit/model"
+	"git.yuntuo.hk/k2safe/orbit/platform/auth"
+	"git.yuntuo.hk/k2safe/orbit/weave/instance"
+)
+
+func registerWorkflowEvents(mux *http.ServeMux, s *instance.Service) {
+	mux.HandleFunc("GET /v1/workflows/{id}/events", wrap(func(r *http.Request, t auth.Token) (any, int, error) {
+		in, err := historyQuery(r, true)
+		if err != nil {
+			return nil, 0, err
+		}
+		out, err := s.ListEvents(r.Context(), t, core.ID(r.PathValue("id")), in)
+		return out, 200, err
+	}))
+	mux.HandleFunc("GET /v1/workflows/{id}/events/{event}", wrap(func(r *http.Request, t auth.Token) (any, int, error) {
+		if _, err := historyQuery(r, false); err != nil {
+			return nil, 0, err
+		}
+		out, err := s.GetEvent(r.Context(), t, core.ID(r.PathValue("id")), core.ID(r.PathValue("event")))
+		return out, 200, err
+	}))
+}

internal/transport/httpserver/workflows.go

@@ -17,6 +17,7 @@ func RegisterWorkflows(server *http.Server, instances *instance.Service, control
 	mux := server.Handler.(*http.ServeMux)
 	registerWorkflowHistory(mux, instances, signals)
 	registerWorkflowQuery(mux, instances)
+	registerWorkflowEvents(mux, instances)
 	mux.HandleFunc("POST /v1/workflows", wrap(func(r *http.Request, t auth.Token) (any, int, error) {
 		if _, err := historyQuery(r, false); err != nil {
 			return nil, 0, err