fix(lang): disambiguate the two Books of Kings in full mode

Both kings_3 and kings_4 carried the full title "Liber Regum", so
--sigla-book full rendered 3 Kings and 4 Kings identically and a reader
could not tell which book a citation named. Seven citations in 2027
alone.

The cause is real and now recorded rather than papered over: this
Missal's incipit "Lectio libri Regum." is UNDIFFERENTIATED -- that exact
unqualified phrase precedes both a "3 Reg." and a "4 Reg." locator in
the same book -- so it is not a valid full title for either volume on
its own. Only the numbered locator distinguishes them, and both "3 Reg"
and "4 Reg" are independently attested in the scans.

The full titles are therefore marked CONSTRUCTED, a third category
beside sourced and UNSOURCED: both halves are transcribed, their
combination is not. The numeral is written in Roman to match this
project's own output convention ("Feria IV", "Hebdomada I").

Abbreviated and --raw output are unchanged.

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