Maps a provider to the constructor kwarg that sets its retry count.
The value is the kwarg name to pass to the provider's chat model constructor.
It is uniformly max_retries for every provider listed today, but this is a
dict rather than a set of providers because retry-kwarg names diverge across
the ecosystem -- some integrations expose a differently named kwarg -- and the
value column lets a future provider register its own name without restructuring
callers.
Membership is verified against each provider's chat model constructor (e.g.
ChatGoogleGenerativeAI exposes max_retries, not retries), not inferred
from naming. Providers absent from this map either lack an integer retry-count
kwarg or are not yet wired as a credential-resolvable provider in this module;
a [retries] config for them is ignored with a warning by _resolve_retry_kwargs.
