Carry the municipality a missing CEP would belong toHEADv0.2.0main

A 404 is rarely a random number: it is usually someone who knows the city
and guessed the digits, and the classic guess is the -000 that 957
municipalities never received. The API now attaches a faixa to the
not-found body naming the municipality that owns the range, so the caller
can say "no such CEP, but that range is Areal/RJ" instead of only "no".

It stays an error. Faixa hangs off CepNotFoundException, never off
Address, and parsing is deliberately lenient: an absent, malformed or
unnamed block yields a null Nullable, so reading the extra context can
never cost the caller the answer it already had.

cep_ini and cep_fim are the smallest and largest CEP that actually exist
there, not the bounds the Correios publish, and the range between them is
sparse — hence ceps, so nobody mistakes the pair for a list.

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