v0.9.1

Added

• A fixer for a <guide> reference whose fragment resolves to nothing
  (RSC-012 / opf.guide.reference_fragment_not_defined, a rule new in epubveri
  0.9.16). The reference names a document that exists and parses, at a #fragment
  that document does not define — on the shelf, a filepos… anchor left behind by
  a MOBI conversion, pointing into a split file that holds no ids at all.

  The fragment is dropped and the path kept:

  <reference type="toc" href="Text/ch1.html#filepos16691"/>
  →
  <reference type="toc" href="Text/ch1.html"/>
  

  This changes no behaviour, which is the argument for it: a fragment resolving to
  no id already opens the document and lands at the top, exactly where the
  fragment-less href lands, so the edit writes down what the book already does.
  The author's real choice — which document is the landmark — is untouched.
  Dropping the whole reference, as the two sibling guide fixers do, would have
  thrown away working navigation; repointing the fragment at some other id would
  have been inventing.

  It declines when dropping the fragment would make the reference identical in
  (type, href) to another one in the same guide — that would clear an RSC-012
  by creating an RSC-017 (duplicate_reference), leaving the book no better.
  The check runs over the whole post-edit guide, so two flagged references that
  would collide with each other are both declined rather than silently merged.

  This completes the opf.guide family for the second time: it was closed at two
  rules on 2026-07-18, and epubveri 0.9.16 added a third. A family is closed
  against the rules that exist, not for good.

Changed

• The epubveri floor moves 0.9.7 → 0.9.16, for the same kind of reason
  the 0.9.7 floor exists. Below 0.9.16, a package in the OEBPS 1.2
  (openebook.org) namespace was judged by EPUB 2's rules and drew six invented
  errors, one of them from a package grammar bound to the OPF namespace — which is
  exactly what fix.epub3_attr_in_epub2_package dispatches on. On such a book that
  fixer could have proposed deleting attributes from a package that was correct.

  Unlike the empty_title case that set the previous floor, this one is argued
  rather than measured: the corpus holds no OEBPS 1.2 book, so there is nothing
  to reproduce it on.

  Measured across the bump on 146 books, nothing else moved: the whole-shelf
  regression audit is byte-identical between 0.9.14 and 0.9.16, and the full rule
  census differs by exactly one row — the new guide-fragment rule, 1 finding in 1
  book. epubveri 0.9.16 also lengthened two message texts; the three fixers that
  match opf.content_document.schema_violation by message shape match a prefix,
  so they are unaffected.

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