Carry the municipality on a not-found CEPHEADv0.2.0main

A CEP that fails a lookup is rarely a random number: it is almost always
someone who knows the city and guessed the digits. The classic guess is
the -000, which 957 municipalities never received. Answering that with a
bare "not found" throws away what the API knows — that the number is in
Areal/RJ's band — and leaves the caller unable to tell a typo apart from
a city that has no such CEP.

The 404 now carries an optional faixa, so cepNotFound carries it too. It
decorates the error and never replaces it: the CEP still does not exist
and the call still throws. Parsing is deliberately incapable of
escalating — a faixa that is absent, null, empty or malformed becomes
nil, because losing the decoration must never cost the clean not-found
underneath it.

Faixa offers no contains(): cep_ini and cep_fim are the smallest and
largest CEP that actually exist, not the bounds the Correios publish,
and the range between them is sparse — Areal's 118 CEPs are spread over
some 4,900 numbers. Only a lookup can answer whether a CEP exists, and
an API that appeared to answer it from the pair would be lying.

Widening cepNotFound's payload breaks anyone matching the case with a
single binding, hence 0.2.0.

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