fix(openai): preset selector effort를 결속한다

caller body에 effort가 없어도 preset selector가 소유한 reasoning effort를 operation 요구사항에 포함해야 올바른 Responses wire를 선택할 수 있다.

apps/edge/internal/openai/chat_handler.go

@@ -398,7 +398,11 @@ func (s *Server) handleChatCompletionsProviderPool(w http.ResponseWriter, dc *ch
 			if err != nil {
 				return tunnelReq, err
 			}
-			return prepareHotPathChatProviderOperation(prepared, selected, chatProviderRequirements(req))
+			requirements := chatProviderRequirements(req)
+			if effort, ok := dc.route.Preset.Selector.Options["reasoning_effort"].(string); ok && strings.TrimSpace(effort) != "" {
+				requirements.Effort = strings.TrimSpace(effort)
+			}
+			return prepareHotPathChatProviderOperation(prepared, selected, requirements)
 		}
 		prepared, err = prepareProviderChatRequestNormalization(prepared, selected)
 		if err != nil {

apps/edge/internal/openai/provider_model_rewrite_test.go

@@ -230,6 +230,20 @@ func TestHotPathOpenAIToolsAndEffortUseResponsesOperation(t *testing.T) {
 	}
 }
 
+func TestChatProviderRequirementsAllowPresetOwnedEffort(t *testing.T) {
+	requirements := chatProviderRequirements(chatCompletionRequest{Tools: []any{map[string]any{"type": "function"}}})
+	if requirements.Effort != "" || !requirements.HasTools {
+		t.Fatalf("caller requirements=%+v", requirements)
+	}
+	presetOptions := map[string]any{"reasoning_effort": "high"}
+	if effort, ok := presetOptions["reasoning_effort"].(string); ok {
+		requirements.Effort = strings.TrimSpace(effort)
+	}
+	if requirements.Effort != "high" || !requirements.HasTools {
+		t.Fatalf("effective selector requirements=%+v", requirements)
+	}
+}
+
 func TestGeminiChatProviderHTTPToolContinuationRoundTrip(t *testing.T) {
 	var providerRequests []map[string]any
 	provider := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {