fix: redesign compaction with tree branching and add thinking support

agent/provider/ollama/client.go

@@ -78,8 +78,12 @@ func (c *Client) GenerateWithModel(ctx context.Context, prompt, model string, fo
 	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
 		return "", fmt.Errorf("decode ollama response: %w", err)
 	}
-	c.Logger.Printf("[ollama] generate done, response_len=%d", len(result.Response))
-	return result.Response, nil
+	response := result.Response
+	if response == "" && result.Thinking != "" {
+		response = result.Thinking
+	}
+	c.Logger.Printf("[ollama] generate done, response_len=%d", len(response))
+	return response, nil
 }
 
 // GenerateStream sends a streaming generate request.

agent/provider/ollama/types.go

@@ -69,10 +69,12 @@ type GenerateRequest struct {
 	Stream  bool   `json:"stream"`
 	Format  any    `json:"format,omitempty"`
 	Options any    `json:"options,omitempty"`
+	Think   *bool  `json:"think,omitempty"`
 }
 
 type GenerateResponse struct {
 	Response string `json:"response"`
+	Thinking string `json:"thinking,omitempty"`
 	Done     bool   `json:"done"`
 }