chavic / rust-payjoin / 29009312991

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Expose transient vs fatal on persisted errors

PersistedError already knows whether the underlying ApiError was
Transient, Fatal, or FatalWithState, but api_error() collapses all
three, so callers cannot tell whether to retry from the same state
or treat the session as closed. Add is_transient() and is_fatal()
accessors.

Carry the distinction through the FFI: ReceiverPersistedError's
Receiver variant becomes Transient and Fatal variants, so bindings
consumers no longer have to treat every persisted error as
session-fatal (or string-match messages) to stay safe. Unclassified
errors map to Fatal, the conservative default for a session-driving
loop.

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