feat(go): publish realtime fields stream

go/vehicle-gateway/internal/eventbus/durable_sink.go

@@ -79,6 +79,16 @@ func (s *DurableSink) PublishUnified(ctx context.Context, env envelope.FrameEnve
 	return s.spool("unified", env)
 }
 
+func (s *DurableSink) PublishFields(ctx context.Context, env envelope.FrameEnvelope) error {
+	if s.isRawPending(env) {
+		return s.spool("fields", env)
+	}
+	if err := s.delegate.PublishFields(ctx, env); err == nil {
+		return nil
+	}
+	return s.spool("fields", env)
+}
+
 func (s *DurableSink) ReplayOnce(ctx context.Context) error {
 	return s.replay(ctx, 0)
 }
@@ -147,7 +157,10 @@ func durableKindOrder(kind string) int {
 	if kind == "unified" {
 		return 1
 	}
-	return 2
+	if kind == "fields" {
+		return 2
+	}
+	return 3
 }
 
 func (s *DurableSink) ReplayLoop(ctx context.Context, interval time.Duration, onError func(error)) {
@@ -184,6 +197,8 @@ func (s *DurableSink) publishRecord(ctx context.Context, record durableRecord) e
 		return s.delegate.PublishRaw(ctx, record.Envelope)
 	case "unified":
 		return s.delegate.PublishUnified(ctx, record.Envelope)
+	case "fields":
+		return s.delegate.PublishFields(ctx, record.Envelope)
 	default:
 		return errUnknownRecordKind(record.Kind)
 	}