fix: enable raw mode for GPT-6 models

internal/plugins/ai/openai/openai.go

@@ -223,6 +223,7 @@ func (o *Client) NeedsRawMode(modelName string) bool {
 	openaiModelsPrefixes := []string{
 		"glm",
 		"gpt-5",
+		"gpt-6",
 		"o1",
 		"o3",
 		"o4",

internal/plugins/ai/openai/openai_test.go

@@ -12,6 +12,12 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+func TestNeedsRawModeGPT6(t *testing.T) {
+	if !NewClient().NeedsRawMode("gpt-6-astra") {
+		t.Fatal("gpt-6 models should use raw mode")
+	}
+}
+
 func TestBuildResponseRequestWithMaxTokens(t *testing.T) {
 
 	var msgs []*chat.ChatCompletionMessage