Fix gosec, govet, and errorlint linter errors

Co-authored-by: Junie <junie@jetbrains.com>

internal/engine/engine.go

@@ -39,10 +39,10 @@ type CallerInfo struct {
 
 // Request is a request to an engine.
 type Request struct {
-	Operation  string
-	Path       string
 	Data       map[string]interface{}
 	CallerInfo *CallerInfo
+	Operation  string
+	Path       string
 }
 
 // Response is a response from an engine.
@@ -69,19 +69,19 @@ type Factory func() Engine
 
 // Mount represents a mounted engine instance.
 type Mount struct {
+	Engine    Engine     `json:"-"`
 	Name      string     `json:"name"`
 	Type      EngineType `json:"type"`
 	MountPath string     `json:"mount_path"`
-	Engine    Engine     `json:"-"`
 }
 
 // Registry manages mounted engine instances.
 type Registry struct {
-	mu        sync.RWMutex
+	barrier   barrier.Barrier
 	mounts    map[string]*Mount
 	factories map[EngineType]Factory
-	barrier   barrier.Barrier
 	logger    *slog.Logger
+	mu        sync.RWMutex
 }
 
 // NewRegistry creates a new engine registry.