Rebuild exception_type around text rules per provider family and one shared
status table. The mapper takes the context, an injected redactor and the
original failure, and returns a PublicError with the message, the real
upstream response and the debug text. Every divergence from the Python
mapper and every known gap is listed in the module header
Match Python on a standalone 429 with an unknown status and on Cohere's
rules for failures without a status. Drop python_repr and the unread
public_failures fixtures
836bf7d897