v0.3.1

Tracks epubveri 0.5.8. No epubsana source changed — the fixers key on the
stable rule/params contract, which held — but one upstream detection fix is
user-visible, so it ships as its own release.

Changed

• epubveri 0.5.7 → 0.5.8. Two upstream detection changes flow through
  without any epubsana code change:
  • epubveri no longer reports the ~250 DTD-declared HTML named entities
    ( , é, ©, …) as undeclared (RSC-016) in EPUB 2,
    where the DOCTYPE's DTD does declare them — it was a false positive. epubsana
    therefore stops proposing to convert those entities in EPUB 2 books: they
    were never broken, so this is repair burden correctly removed, not lost
    coverage. Genuinely undeclared entities still report, and EPUB 3 (which
    wants numeric character references) is unchanged. Expect fewer
    html_entities proposals on EPUB 2 books.
  • RSC-005 content-model findings now carry the offending element's name in
    params (previously empty). No behavior change here — epubsana's RSC-005
    consumer keys on the NCX-NCName rule, not the content-model one — but the
    forthcoming content-model fixer gets the element name for free.

Full notes: CHANGELOG.md. Also on crates.io.