feat: version ai result schemas

internal/llm/client.go

@@ -38,11 +38,14 @@ type Usage struct {
 	TotalTokens      int `json:"total_tokens"`
 }
 
+const ChatResultSchemaVersion = "ai.chat_result.v1"
+
 type ChatResult struct {
-	Content    string `json:"content"`
-	Model      string `json:"model"`
-	Usage      *Usage `json:"usage,omitempty"`
-	DurationMS int64  `json:"duration_ms"`
+	SchemaVersion string `json:"schema_version"`
+	Content       string `json:"content"`
+	Model         string `json:"model"`
+	Usage         *Usage `json:"usage,omitempty"`
+	DurationMS    int64  `json:"duration_ms"`
 }
 
 type chatRequest struct {
@@ -137,10 +140,11 @@ func (c *Client) Chat(ctx context.Context, in ChatInput) (*ChatResult, error) {
 		modelName = c.model
 	}
 	return &ChatResult{
-		Content:    out.Choices[0].Message.Content,
-		Model:      modelName,
-		Usage:      out.Usage,
-		DurationMS: duration.Milliseconds(),
+		SchemaVersion: ChatResultSchemaVersion,
+		Content:       out.Choices[0].Message.Content,
+		Model:         modelName,
+		Usage:         out.Usage,
+		DurationMS:    duration.Milliseconds(),
 	}, nil
 }