fix: remove hardcoded temperature (unsupported by GPT-5)

GPT-5 via SAP AI Core only supports temperature=1 (default).
Remove the hardcoded 0.1 and use omitempty so the field is not sent.

llm/client.go

@@ -37,7 +37,7 @@ type Message struct {
 type ChatRequest struct {
 	Model       string    `json:"model"`
 	Messages    []Message `json:"messages"`
-	Temperature float64   `json:"temperature"`
+	Temperature float64   `json:"temperature,omitempty"`
 }
 
 // ChatResponse is the response from the API.
@@ -54,7 +54,7 @@ func (c *Client) Complete(messages []Message) (string, error) {
 	reqBody := ChatRequest{
 		Model:       c.Model,
 		Messages:    messages,
-		Temperature: 0.1,
+		
 	}
 
 	data, err := json.Marshal(reqBody)