matins.ts's three-nocturn gate correctly governed nocturn count
(Sunday, or Duplex+) but wrongly reused the literal Sunday psalmody as
content for every three-nocturn day, including a weekday feast. Live-
verified (Monastic Tridentinum 1617) that a Duplex+ weekday feast has
its own genuinely different psalmody -- confirmed per-Common-category,
not per-saint, by cross-checking St. Lawrence against St. Ignatius of
Antioch (a different Martyr sub-category, nearly identical psalm
numbers, different antiphons).
New mechanism (matins-psalmody-overrides.ts, mirroring the Lauds one
but keyed per-category) with St. Lawrence authored as the live-verified
proof; falls back to the plain ferial weekday table, redistributed into
3 nocturns, for every other Duplex+ id until its own category's content
is authored. Also generalizes the canticle shape to support a citation
spanning multiple scripture chapters under one heading (Lawrence's own
Nocturn 3), and adds the new Sirach/Jeremiah chapters his canticles cite.
