## v1.12.0 (2026-09-06)

genre_distribution: genre shares for the whole library

• New analytics.genre_distribution(db) answers "what fraction of the
  library is each genre" over Calibre's genre-as-hierarchical-tags
  convention. Every dot-path node rolls up its subtree (Fic.Fantasy.Epic
  contributes to Fic, Fic.Fantasy, and itself), shares are fractions of
  every book in the library, and a book counts once per node even when
  several of its tags share an ancestor. Multi-genre books therefore land
  in several roots and the shares can legitimately sum over 1.0; the
  docstring says so where renderers will read it. Nodes come back
  depth-first (parents before children, siblings share-descending then
  name) so both a top-level headline slice and a full tree render are
  plain dict walks; books with no tags count under "untagged", last.
• Deliberately not a duplicate of get_tag_counts (flat per-tag link
  counts): the rollup, the denominator, and the untagged bucket are the
  delta the analytics module's scope rule demands. CalibreQuarry's
  --analytics genres (3.27.0) is the first renderer.
• Suite 255 → 258.