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-a-confessor-bishop.yml

@@ -0,0 +1,16 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Terce.
+# Extracted (2026-08) from Chair of St. Peter at Rome, Chair of St. Peter
+# at Antioch, and St. Martin of Tours's independently-authored content,
+# confirmed byte-for-byte identical via diff — see
+# prime-antiphon-common-of-a-confessor-bishop.yml's header. Martin has
+# his own proper antiphons; only the chapter is shared for him.
+id: terce-capitulum-common-of-a-confessor-bishop
+text:
+  la: "Ecce sacérdos magnus, qui in diébus suis plácuit Deo, et invéntus est justus: et in témpore iracúndiæ factus est reconciliátio. R. Deo grátias. V. Amávit eum Dóminus, et ornávit eum. R. Stolam glóriæ índuit eum."
+  en: "Behold an high priest, who in his days pleased God, and was found righteous, and in the time of wrath he was made a propitiation. R. Thanks be to God. V. The Lord loved him and beautified him. R. He clothed him with a robe of glory."
+citation:
+  la: "Sir 44:16-17"
+  en: "Sir 44:16-17"
+status:
+  la: verified
+  en: verified