Expose transport and malformed generation errors

internal/llm/openai_compatible_client.go

@@ -21,6 +21,7 @@ var (
 	ErrInvalidConfig     = errors.New("invalid llm client configuration")
 	ErrInvalidRequest    = errors.New("invalid generate request")
 	ErrRequestFailed     = errors.New("llm request failed")
+	ErrTransport         = errors.New("llm transport failed")
 	ErrUnexpectedStatus  = errors.New("llm returned non-success status")
 	ErrMalformedResponse = errors.New("malformed llm response")
 )
@@ -36,7 +37,7 @@ func (e *requestFailedError) Error() string {
 }
 
 func (e *requestFailedError) Unwrap() []error {
-	return []error{ErrRequestFailed, e.cause}
+	return []error{ErrRequestFailed, ErrTransport, e.cause}
 }
 
 type OpenAICompatibleConfig struct {