uber / h3-go / 37548259433

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conformance: add curated files of known-trap inputs (#159)

Seeded sampling gives coverage density but is blind to the specific
inputs that have broken implementations. Six curated files hold such
inputs by hand, each in exactly its group's record type so the existing
runners pick them up by directory with no new code: the indexes the
reference's command-line tests and test applications single out, the
reference's checked-in compact and multipolygon cell lists, and the
polygons from its reported-issue and transmeridian tests. The README
lists every subject with its provenance; the generator holds them as
tables and draws nothing for them.

The regions id becomes a name for these rows, the sets id is
curated:<name>, and the traversal subject is now the origin and target
pair because curated origins repeat. A fill of no cells now writes an
empty multiPolygon sequence rather than the reference's single
structure with no loops, which the sampled files never produced.

The files found two things. The reference's gridDistance to a target
whose unused digits are not 7 returns 0, and one of its own
gridPathCells fixtures gets a distance of 81 with no path; both are
recorded as the reference's answers and pure Go matches them. Its
classic polygonToCells fails with E_FAILED on the polar band its tests
use, by design, because the size estimate is too small for a polygon
that wide near the pole, while pure Go allocates dynamically and
returns the cells. That is a deliberate difference, so the polar band
is not in the file and is noted in the README's discussion instead.

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

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4540 of 4540 relevant lines covered (100.0%)

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