Extract shared Commons for Prime/Terce/Sext/None minor-hour content

A systematic diff across all 29 duplex-majus+ saints' P/T/S/N files found
real shared-Common groups beyond the pairs noticed in passing while
authoring them. Extracted into shared data/propers/common/{hour}-antiphon-
common-of-*.yml / {hour}-capitulum-common-of-*.yml files and wired via a
new SaintRecord.minorHoursCommon field, with resolveMinorHourAntiphon/
resolveMinorHourChapter falling back to it when a saint has no proper file
of their own. Deliberately a separate field from the existing (previously
unused) `common` field: the minor hours don't always draw from the same
Common category as the saint's overall classification -- both Chair of
St. Peter feasts are `common: common-of-an-apostle` by rank, but their
P/T/S/N content is Common of a Confessor Bishop (Peter considered as
bishop of that see).

Four groups extracted (87 duplicate files collapsed to 21 shared ones),
each confirmed byte-identical via diff first: common-of-apostles (8
saints, all 4 hours), common-of-a-confessor-bishop (Chair of Peter pair
share antiphons+chapters, Martin of Tours shares only chapters), common-
of-the-bvm (Nativity BVM + Immaculate Conception's Sext/None/Terce
chapters -- the Assumption's own stay proper, different reading + proper
versicles), and common-of-st-peter (St. Peter ad Vincula + Ss. Peter and
Paul, not a real Common category, just genuinely identical Petrine
content).

Deliberately left un-extracted: St. Mark, St. John Before the Latin Gate,
and Ss. Philip and James share identical text that live-checking shows is
Paschaltide-seasonal (all three landed within the Easter octave weeks on
their queried dates, despite disagreeing `common` classifications) rather
than a fixed per-saint-category Common -- folding it into the same
mechanism would misrepresent season-contingent content as timeless. Left
as individually-authored files; flagged in TODO.md as needing a real
Paschaltide-awareness mechanism this app doesn't have yet for any hour.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/data/propers/common/terce-capitulum-common-of-the-bvm.yml

@@ -0,0 +1,19 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Terce.
+# Extracted (2026-08) from the Nativity of the BVM and the Immaculate
+# Conception's independently-authored content, confirmed byte-for-byte
+# identical via diff. The Assumption's own Terce capitulum uses a
+# *different* reading (Sir 24:11-12, not this Sir 24:14) and proper
+# versicles even where the Sext/None reading bodies do match this Common
+# — a first-class feast's proper office overriding the plain Common,
+# still worth a fully proper file rather than forcing it in here (see
+# assumption's own terce/sext/none-capitulum files and TODO.md).
+id: terce-capitulum-common-of-the-bvm
+text:
+  la: "Ab inítio et ante sǽcula creáta sum, et usque ad futúrum sǽculum non désinam, et in habitatióne sancta coram ipso ministrávi. R. Deo grátias. V. Spécie tua et pulchritúdine tua. R. Inténde, próspere procéde, et regna."
+  en: "From the beginning, and before the world, was I created, and unto the world to come I shall not cease to be, and in the holy dwelling place I have ministered before him. R. Thanks be to God. V. In thy comeliness and thy beauty. R. Go forward, fare prosperously, and reign."
+citation:
+  la: "Sir 24:14"
+  en: "Sir 24:14"
+status:
+  la: verified
+  en: verified