chavic / rust-payjoin / 29009312885

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Add kind accessors to receive candidate errors

CoinSelectionError and InputContributionError are opaque because
their variants may change, but that leaves callers of
try_preserving_privacy and contribute_inputs unable to distinguish
failures that could succeed with a different candidate set from
failures no candidate change can fix, short of matching display
strings. A wallet driving selection with a retry loop burns
attempts on the second class.

Add kind() returning a non_exhaustive kind enum on both errors:
callers get a stable, matchable classification while the error
types stay free to evolve, since new variants only require a new
kind category and consumers must already handle unknown kinds.
Mirror the accessors in payjoin-ffi with an explicit Other
catch-all, giving bindings the same signal; today these errors
cross the FFI as display-only objects.

Related to #1422.

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