fix(multiplayer): propagate allocated playlist

server/allocator/worker.go

@@ -59,10 +59,14 @@ func (w Worker) RunOnce(ctx context.Context) (bool, error) {
 // template. They are derived only from the durable match plan, never client
 // input or mutable worker configuration.
 func AllocationLabels(request domain.AllocationRequest) map[string]string {
-	return map[string]string{
+	labels := map[string]string{
 		"cosmic-clash.io/region":    request.Region,
 		"cosmic-clash.io/build":     request.Build,
 		"cosmic-clash.io/protocol":  strconv.Itoa(request.Protocol),
 		"cosmic-clash.io/transport": request.Transport,
 	}
+	if request.Playlist != "" {
+		labels["cosmic-clash.io/playlist"] = string(request.Playlist)
+	}
+	return labels
 }

server/allocator/worker_test.go

@@ -85,3 +85,10 @@ func TestAllocationLabelsMirrorFleetCompatibilityTuple(t *testing.T) {
 		t.Fatalf("labels=%v want=%v", got, want)
 	}
 }
+
+func TestAllocationLabelsCarryPlaylistWhenKnown(t *testing.T) {
+	labels := AllocationLabels(domain.AllocationRequest{Playlist: domain.Ranked, Region: "EU", Build: "build-1", Protocol: 1, Transport: "enet"})
+	if labels["cosmic-clash.io/playlist"] != string(domain.Ranked) {
+		t.Fatalf("playlist label = %q, want %q", labels["cosmic-clash.io/playlist"], domain.Ranked)
+	}
+}