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

internal/config/config.go

@@ -26,6 +26,11 @@ type OSDConfig struct {
 	// channels: armed while that channel stays above the threshold.
 	ArmIndex       int   `yaml:"arm_index"`
 	ArmedThreshold int16 `yaml:"armed_threshold"`
+	// VtxTableGen and VtxTableHash are the operator-selected VTX power
+	// table identifiers. Zero means no table is selected yet; a static
+	// selection is operator intent and never applied VTX state.
+	VtxTableGen  uint32 `yaml:"vtx_table_gen"`
+	VtxTableHash uint64 `yaml:"vtx_table_hash"`
 }
 
 type Config struct {

internal/config/config_test.go

@@ -67,7 +67,7 @@ func TestDefaultConfigPublishesOSDSnapshotsFromAUX1(t *testing.T) {
 
 func TestLoadOverridesOSDSettings(t *testing.T) {
 	path := filepath.Join(t.TempDir(), "config.yml")
-	body := "osd:\n  state_path: /tmp/osd-state.bin\n  arm_index: 6\n  armed_threshold: 256\n"
+	body := "osd:\n  state_path: /tmp/osd-state.bin\n  arm_index: 6\n  armed_threshold: 256\n  vtx_table_gen: 3\n  vtx_table_hash: 9\n"
 	if err := os.WriteFile(path, []byte(body), 0644); err != nil {
 		t.Fatal(err)
 	}
@@ -83,6 +83,19 @@ func TestLoadOverridesOSDSettings(t *testing.T) {
 	if cfg.OSD.ArmIndex != 6 || cfg.OSD.ArmedThreshold != 256 {
 		t.Fatalf("arm config=%+v want the overrides", cfg.OSD)
 	}
+	if cfg.OSD.VtxTableGen != 3 || cfg.OSD.VtxTableHash != 9 {
+		t.Fatalf("table config=%+v want the selected table", cfg.OSD)
+	}
+}
+
+func TestDefaultConfigSelectsNoVtxTable(t *testing.T) {
+	// No table exists yet: the operator selection defaults to none, so the
+	// OSD shows an explicit pending table instead of static configuration
+	// dressed up as applied VTX state.
+	cfg := Default()
+	if cfg.OSD.VtxTableGen != 0 || cfg.OSD.VtxTableHash != 0 {
+		t.Fatalf("table config=%+v must default to no selection", cfg.OSD)
+	}
 }
 
 func TestLoadRejectsArmAndVideoIndexesOutsideTheChannelRange(t *testing.T) {