bible(grb): restrict to the Vulgate canon; restore Hosea and Zechariah

grb failed corpus-check outright: 15 errors, and two whole books absent from
lectio at runtime with no error and no warning.

Upstream grb is a standalone Septuagint reader carrying 87 books. lectio needs
one uniform canon, so scripts/gen-grb-lectio.py derives the 73 books vul has
rather than forking -- upstream stays intact and keeps everything.

Eleven books have no Vulgate counterpart and are dropped, including 2 Esdras,
which upstream's README explains IS Ezra + Nehemiah under the Septuagint's
name; verified byte-identical, so nothing is lost. Five books ARE canonical
under other names and are remapped, and the verse counts show which witness
the Vulgate follows -- Jerome translated Theodotion, not the Old Greek:

    Bel and the Dragon (Theodotion)  42 = vul Daniel 14 (42)   exact
    Bel and the Dragon (LXX)         37                        no
    Sussana (Theodotion)             64 = vul Daniel 13 (65)
    Sussana (LXX)                    37                        no
    Letter of Jeremiah               73 = vul Baruch 6  (72)
    Wisdom of Solomon               435 = vul Wisdom   (439)

Upstream's plain "Daniel" is the Old Greek and is missing chapter 4 outright,
so Theodotion supplies Daniel throughout: complete, and the tradition the
lectionary actually cites. lectio thereby GAINS Wisdom, Daniel 4, Daniel 13-14
and Baruch 6 in Greek rather than losing them.

Three upstream defects are repaired in transit:

  * 408 rows carried 5 fields, not 6 -- a lost tab fused the book number and
    chapter ("281" = book 28, chapter 1). Every one was in Hosea or Zechariah,
    and neither book had a single well-formed row, so bible.go skipped both
    entirely. Hosea (197 verses) and Zechariah (211) are back.
  * 5 merged verse labels ("27-28") that strconv.Atoi turns into verse 0.
  * A UTF-8 BOM welded to the first book name, making "Genesis" a phantom
    74th book matching nothing.

The SBLGNT apparatus sigla are stripped, as TestGrbNoApparatusMarkers
requires; regenerating from raw upstream reintroduces ~8700 of them.

grb now passes. The remaining warnings are the Septuagint being itself --
Jeremiah is LXX-numbered (grb 33:2 is the Vulgate's 26:2), Esther integrates
its additions into chapters 1-10, LXX Malachi has three chapters, and 3
Kingdoms carries supplements like 10:22a that upstream stores as a duplicate
verse 22. Silencing those would mean deleting real Greek text.

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