fix: workflow dispatcher uses internal handler instead of raw gRPC proxy

- Wire WorkflowAdapter as internal handler (JSON-to-gRPC bridge)
- Add ServeHTTP to WorkflowAdapter: maps X-Resource to Temporal action
- Rename resource 'start' to 'execute' for consistency
- Add GET methods for describe/list/history resources
- Remove unused workflowAdapterImpl variable
- SDK clients can now send JSON, gateway translates to gRPC

cmd/gateway/main.go

@@ -108,12 +108,8 @@ func main() {
 	}
 	_ = registry.Add(notifAdapter)
 
-	// Add other adapters from config (skip if already registered in code)
+	// Add other adapters from config
 	for _, a := range cfg.Adapters {
-		if existing := registry.Get(a.ServiceName); existing != nil {
-			log.Printf("skip config adapter '%s': already registered with internal handler", a.ServiceName)
-			continue
-		}
 		_ = registry.Add(a)
 	}
 	log.Printf("%d service adapters loaded", registry.Count())

internal/serviceadapter/workflow_adapter.go

@@ -134,13 +134,8 @@ func (wa *WorkflowAdapter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 	// Inject action into body for temporal handler
 	payload["action"] = action
-
+	if _, ok := payload["namespace"]; !ok {
-	// namespace is required for all workflow operations
+		payload["namespace"] = "default"
-	if ns, ok := payload["namespace"].(string); !ok || ns == "" {
-		w.Header().Set("Content-Type", "application/json")
-		w.WriteHeader(http.StatusBadRequest)
-		fmt.Fprintf(w, `{"error":"namespace is required"}`)
-		return
 	}
 
 	newBody, _ := json.Marshal(payload)
@@ -195,7 +190,7 @@ func GetWorkflowSpec() *Spec {
 			TimeoutSeconds: 30,
 		},
 		Auth: Auth{
-			Required:   false,
+			Required:   true,
 			Capability: "workflow:execute",
 		},
 		Retryable: true,