fix(tests): use recorded realtime events

Read event snapshots through the fake transport accessor. The merged
scene and diarization tests still used removed fields and methods.

Assisted-by: Codex:GPT-6 go-vet

core/http/endpoints/openai/realtime_semantic_vad_test.go

@@ -303,7 +303,7 @@ var _ = Describe("liveTurnState", func() {
 			lts.drainEvents(3.4)
 
 			var got []types.ConversationItemInputAudioTranscriptionSegmentEvent
-			for _, e := range ftr.events() {
+			for _, e := range ftr.recordedEvents() {
 				if seg, ok := e.(types.ConversationItemInputAudioTranscriptionSegmentEvent); ok {
 					got = append(got, seg)
 				}
@@ -326,7 +326,7 @@ var _ = Describe("liveTurnState", func() {
 			lts.drainEvents(1.0)
 
 			var got []types.ConversationItemSoundDetectionEvent
-			for _, e := range ftr.events() {
+			for _, e := range ftr.recordedEvents() {
 				if sd, ok := e.(types.ConversationItemSoundDetectionEvent); ok {
 					got = append(got, sd)
 				}

core/http/endpoints/openai/realtime_transcription_test.go

@@ -65,7 +65,7 @@ var _ = Describe("emitTranscription", func() {
 
 		segmentEvents := func(t *fakeTransport) []types.ConversationItemInputAudioTranscriptionSegmentEvent {
 			var out []types.ConversationItemInputAudioTranscriptionSegmentEvent
-			for _, e := range t.sent {
+			for _, e := range t.recordedEvents() {
 				if seg, ok := e.(types.ConversationItemInputAudioTranscriptionSegmentEvent); ok {
 					out = append(out, seg)
 				}