uber / h3-go / 37337061110

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conformance: add the polygons and validity digest streams (#157)

Two streams the digests group was missing, both format additions, landed
together so the digest files change shape once.

polygons: for every cell at resolutions 0 through 2, the boundary scaled
about its center by 0.8 and by 1.2, exactly as the regions group scales
it, filled two resolutions finer by polygonToCellsExperimental in the four
containment modes; eight sets per line. It is a thirteenth stream in the
existing resolutions and baseCells files, present only on rows at or
below resolution 2, so a mismatch still localises to a base cell.
Resolution 3 would be seven times the fills for the same code paths and
about 25 seconds per run in Go.

validity: digests/patterns.jsonl, a stream of 64-bit words that are not
cells, each line giving isValidCell, isValidIndex, isValidDirectedEdge and
isValidVertex. Uniform words are almost always invalid on the mode bits
alone, so seven of eight draws take a valid cell and disturb one field:
mode, reserved bits, resolution, base cell, a digit, the high bit, or the
mode set to edge or vertex with random reserved bits. Digests are recorded
at one hundred thousand, one million and ten million patterns of the same
stream. The Go runner checks to one million by default and
H3_CONFORMANCE_PATTERNS_MAXCOUNT raises it.

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

1 of 1 new or added line in 1 file covered. (100.0%)

4540 of 4540 relevant lines covered (100.0%)

2694307.54 hits per line