Retry policy cannot inspect response body when printers are enabled

When response printers are enabled, printing the response consumes its body before the retry policy evaluates it.
As a result, retry conditions that inspect the response body may fail to trigger.

Start by reproducing the issue with response printers enabled and a retry condition that inspects the response body. Trace the response-printing and retry-evaluation paths, then add coverage showing that body-based retry conditions still work after printing; done means the existing behavior is preserved with printers enabled.

Written by the indexing model from the issue text.