Fill Luna completed output

codex-luna-compat.patch

@@ -139,10 +139,10 @@ index 697cc96..299247f 100644
  			if streamResponse.Response != nil {
 diff --git a/relay/channel/openai/responses_codex_compat.go b/relay/channel/openai/responses_codex_compat.go
 new file mode 100644
-index 0000000..00aa2f6
+index 0000000..c7df595
 --- /dev/null
 +++ b/relay/channel/openai/responses_codex_compat.go
-@@ -0,0 +1,244 @@
+@@ -0,0 +1,254 @@
 +package openai
 +
 +import (
@@ -166,6 +166,7 @@ index 0000000..00aa2f6
 +	contentStartedBy map[string]bool
 +	contentDoneBy    map[string]bool
 +	textByID         map[string]*strings.Builder
++	lastMessageID    string
 +}
 +
 +func newCodexResponsesStreamState() *codexResponsesStreamState {
@@ -207,6 +208,9 @@ index 0000000..00aa2f6
 +			s.nextOutputIndex = *outputIndex + 1
 +		}
 +		s.outputIndexByID[itemID] = *outputIndex
++		if event.Item != nil && event.Item.Type == "message" {
++			s.lastMessageID = itemID
++		}
 +	}
 +	if outputIndex == nil && itemID != "" {
 +		if idx, ok := s.outputIndexByID[itemID]; ok {
@@ -291,7 +295,13 @@ index 0000000..00aa2f6
 +			}
 +		}
 +	case "response.completed", "response.done":
-+		if event.Response != nil && len(event.Response.Output) == 0 && itemID != "" {
++		if event.Response != nil && len(event.Response.Output) == 0 {
++			if itemID == "" {
++				itemID = s.lastMessageID
++			}
++			if itemID == "" {
++				break
++			}
 +			text := ""
 +			if builder := s.textByID[itemID]; builder != nil {
 +				text = builder.String()
@@ -389,10 +399,10 @@ index 0000000..00aa2f6
 +}
 diff --git a/relay/channel/openai/responses_codex_compat_test.go b/relay/channel/openai/responses_codex_compat_test.go
 new file mode 100644
-index 0000000..aa59f50
+index 0000000..5944b97
 --- /dev/null
 +++ b/relay/channel/openai/responses_codex_compat_test.go
-@@ -0,0 +1,91 @@
+@@ -0,0 +1,90 @@
 +package openai
 +
 +import (
@@ -476,7 +486,6 @@ index 0000000..aa59f50
 +
 +	completed := dto.ResponsesStreamResponse{
 +		Type:     "response.completed",
-+		ItemID:   "item_1",
 +		Response: &dto.OpenAIResponsesResponse{Model: "gemini-3.7-flash", Output: []dto.ResponsesOutput{}},
 +	}
 +	_, completedData, _, err := state.normalize(&completed, `{"type":"response.completed","response":{"model":"gemini-3.7-flash","output":[]}}`)