Changes in version 0.0.0.9000                      

  - st_as_sf() now returns polygons that draw correctly on flat
    longitude/latitude maps: cells crossing the antimeridian are split
    into MULTIPOLYGONs, cells containing a pole are closed along
    latitude ±90, and long edges follow their great circles. Spherical
    areas are unchanged. Use wrap = FALSE for the raw spherical
    polygons. Unprojected plot() displays use the same geometry, so
    polar cells no longer smear across the map.
  - Bundled DGGRID 9.03b source, compiled without GDAL at install time,
    so no separate DGGRID installation is needed. The package is now
    AGPL-3.0-or-later.
  - cell_cover() clips with DGGRID's AIGEN format and applies polygon
    holes in R, keeping cells on islands inside holes.
  - Fixed automatic plot resolution failing ("No source cells are
    visible") for wide regional datasets, such as North Atlantic storm
    tracks.
  - Fixed raster_to_cell() failing for rasters narrower than 60 degrees
    that do not cross a multiple of 60 degrees longitude.
  - point_to_cell() recognizes a long column for longitude.
  - New README with rendered examples, and three vignettes: getting
    started, plotting, and rasters and polygons.
  - Added an IGEO7/Z7-first API over DGGRID 9.x.
  - Added ISEA3H/Z3 selection and a partial dggridR compatibility
    fallback.
  - Added conversion, boundary, neighbor, traversal, hierarchy, sf, and
    polygon fill helpers with H3-like snake-case names.
  - Reworked cells as vctrs vectors supporting mixed resolutions.
  - Separated grid identity from DGGRID backend configuration.
  - Standardized cell operations on a cell_ grammar and type-stable
    relation tibbles.
  - Made the legacy dggridR fallback explicit and added classed cli
    errors.
  - Deduplicated point, sequence-number, relation, and geometry requests
    before invoking their backends while preserving the original result
    order.
  - Batched hierarchy and graph traversal work by resolution and search
    depth, including shared searches for repeated distance origins.
  - Standardized optional-package checks with rlang's package-checking
    API.
  - Switched center extraction from GeoJSON to compact DGGRID text
    output and added bounded internal chunks for large point, center,
    boundary, and sequence-number requests.
  - Added delayed cli progress for hierarchy, graph traversal, distance,
    and polygon-cover operations without adding a runtime dependency.
  - Added cell_grid() and fast or backend-confirmed cell_is_valid()
    helpers.
  - Added regression coverage for all 12 pentagons, seam-crossing
    antimeridian cells, polar cells, larger graph radii, and forced
    multi-chunk execution.
  - Added a development-only bench harness excluded from package builds.
  - Added lazy hex_data() tables and a base plot() method that
    constructs geometry only after hierarchical aggregation.
  - Added cell_aggregate() and viewport/device-aware plot_resolution()
    with numeric, logical, and categorical aggregation semantics.
  - Made parent lookup a local Z7/Z3 index operation, removing a DGGRID
    process from parent aggregation and level-of-detail selection.
  - Added center-only viewport selection, antimeridian handling,
    projection after aggregation, fixed-resolution plotting, and a lod =
    FALSE escape hatch.
  - Added 100 thousand, 1 million, and 10 million row plotting
    benchmarks and a naive fine-polygon comparison.
  - Added cell_sample() for fast center-point extraction from SpatRaster
    layers without cell polygons.
  - Added cell_extract() for exact raster-pixel coverage with
    area-weighted continuous defaults and categorical mode extraction.
  - Added raster_to_cell() with edge-cell padding, projected-raster
    support, and 0-to-360 longitude handling; all raster helpers return
    lazy globalhex_data objects.
  - Made full-longitude raster conversion enumerate the bounded whole
    DGGS instead of sending globe-spanning polygons through DGGRID's
    clipper.
  - Added controllable cell_cover() edge densification and made long
    DGGRID failures safe and concise while retaining their full
    diagnostic text.
  - Made raster conversion drop all-missing cells by default and made
    plotting ignore missing values before LOD selection, avoiding
    needless downsampling for sparse global rasters.
  - Added render = "auto", "polygon", or "raster" plotting. Automatic
    mode rasterizes large display layers through optional terra, keeps
    explicit borders vector-based, and records the renderer on the
    returned data.