v0.8.0 — configurable citations

Citations are parsed into structure and re-rendered, so book names,
abbreviations, punctuation style and numbering tradition become files a
user edits rather than values frozen in the data.

- lib/citation: Book (62 spellings -> 45 ids), Parse, Render, Sigla
- [bible] and [sigla] sections in language files
- lang/traditions.ini: which book a reference DENOTES (vulgate | modern)
- --sigla-style, --sigla-book, --sigla-tradition; three config keys
- 45 Latin book titles sourced from the 1962 Missal scans; 10 marked
  UNSOURCED and 2 CONSTRUCTED rather than invented
- --raw emits every citation byte-for-byte as stored, verified identical
  across all 3,074,246 lines of the 1583-9999 domain

Known limit, recorded in the spec: shipped styles do not re-parse their
own rendered output (spec section 8.5).