bible(corpus-check): warn on a verse present but stubbed vs the Vulgate

The count-based checks (gap, duplicate, missing chapter) only see a verse's
presence, so a verse that IS there but truncated -- a lost opening line, a merge
artifact, the exact class that lost 44 psalm openings and Acts 6:5 from the old
Wujek scrape -- passes silently.

Add a warning for it, compared CROSS-CORPUS to the aligned Vulgate verse (never
within the chapter). That is deliberate: a genuinely terse verse ("Non occides",
"Jesus wept") is short in the Vulgate too, so it is not flagged; only a corpus
stub against a substantial Vulgate verse fires (corpus <12 chars, <1/4 of a
Vulgate verse >=40). Rune-counted (script-agnostic) and skipped on the Psalms
when the corpus renumbers them (psalm_system != vulgate), where per-verse
alignment with the Vulgate would not hold.

Warning only, never an error. Zero false positives across vul/wuj/drb/grb;
a `stub` testdata fixture (Genesis 1:1 = "x") exercises a real hit.

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