Changes in version 0.0.1 (2026-07-06)                  

  - Initial release. Shared landscape-genetic primitives extracted from
    terradish so that the symmetric (terradish) and asymmetric
    (dragonflow) network methods stand on a common, dependency-light
    base.
  - Graph: deme_graph() builds a lightweight deme/landscape graph
    (vertex coordinates + undirected edge list) from coordinates, with
    Delaunay, k-nearest- neighbour, or lattice (rook/queen) adjacency.
    The result is class c("landgraph", "terradish_graph").
  - Genetic covariance / distance: cov_from_biallelic(),
    cov_from_genetic_data(), fst_from_biallelic(), dist_from_cov(),
    dist_from_biallelic().
  - Directional edge covariates: edge_gradient() (gradient of a scalar
    potential) and edge_flow() (projection of a vector flow field,
    carrying a curl component).
  - cov_from_biallelic() applies the per-locus pooled frequency
    correctly per column (fixes a column-major recycling error that
    affected multi-deme covariances).