Surface the faixa a 404 now carriesHEADv0.2.0main

A CEP that fails is almost never a random number. It is someone who knows
the city and guessed the last digits, and the guess is usually the -000 that
957 municipalities never received. The API answers those 404s with a faixa
object naming the municipality that owns the band, which turns "not found"
from a dead end into something the caller can act on - and the caller cannot
reach it through this library, because the 404 path never looked at the body
at all.

cepis_error is where a 404 already reports itself, so faixa goes there, as
inline storage rather than a pointer: the struct is documented as owning
nothing and declared on the caller's stack, and that stays true. It costs
sizeof(cepis_error), 272 bytes to 384, so 0.2.0 needs a recompile.

The parser needed one new primitive. cepis__json_field could only pull
scalars out of a flat object; splitting it over cepis__json_find, which
returns a pointer to a value of any shape, reaches one level down without
building a document tree - the same depth cepis__geo_parse already needs for
geo. Absence is the case that matters: no faixa, an empty one, or one that
is not an object all leave the error byte-for-byte what it was before.

cep_ini and cep_fim are deliberately not presented as a range. They are the
lowest and highest CEP that exist, the band is sparse - Areal's 118 CEPs are
scattered over ~4900 numbers - and ceps is the only honest count.

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