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feat: add pure-Go CellToLatLng & CellToBoundary to x/h3go

Implement the reverse projection pipeline in pure Go: CellToLatLng
(+ Cell.LatLng) and CellToBoundary (+ Cell.Boundary), with the supporting
FaceIJK/coordIJK/vec2d/vec3d geometry, substrate grids, and overage
adjustment. Verified against the cgo reference via paritytest and by
LatLngToCell round-trips, with regression cases ported from the C tests.

Refactors applied across the package:
- Convert input-parameter helpers to methods on their natural receiver type,
  with one canonical receiver name per type.
- Inline pure-delegation unexported helpers into their exported methods
  (resolution, baseCellNumber, isPentagon); collapse isValid's guard in.
- Add isResClassIII(res) helper, replacing scattered %2 == 1 checks.
- Exclude mnd for x/h3go via path-scoped .golangci.yml rule (geometric and
  bit-layout constants are inherent, not magic) and drop the now-unused
  //nolint:mnd directives; keep gosec.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>