feat: publish adaptive-link OSD contract and keep overlay above video (#3)

cmd/groundstation-display/main_test.go

@@ -96,7 +96,14 @@ func TestBuildTargetOSDLayerRendersPublishedSnapshots(t *testing.T) {
 	publisher := osd.NewFilePublisher(state, nil)
 	defer publisher.Close()
 
-	snapshot := osd.Snapshot{Sequence: 11, Armed: true, Power: true}
+	snapshot := osd.Snapshot{
+		Sequence: 11,
+		Armed:    true,
+		OpConfig: osd.OperatorConfig{MaxPower: 95},
+		Policy:   osd.GSPolicy{Pending: true},
+		Ack:      osd.VTXAck{Pending: true, Lifecycle: osd.VTXLifecyclePending},
+		Link:     osd.GSObservedLink{Known: false},
+	}
 	publisher.Publish(snapshot)
 	deadline := time.Now().Add(2 * time.Second)
 	for time.Now().Before(deadline) {
@@ -117,7 +124,7 @@ func TestBuildTargetOSDLayerRendersPublishedSnapshots(t *testing.T) {
 	surface := &recordingCanvas{width: 800, height: 600}
 	osdLayer.Template.Draw(surface)
 
-	want := []string{"ARM ARMED", "PWR ON"}
+	want := []string{"ARM ARMED", "VTX tbl:-- ceil:95 req:-- ack:--"}
 	if len(surface.lines) != len(want) {
 		t.Fatalf("OSD lines=%q want %q from the supervisor-published snapshot", surface.lines, want)
 	}